diff --git a/api/BUILD.gn b/api/BUILD.gn
index 4aa42d407b..e3cff310b7 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -354,6 +354,7 @@ if (rtc_include_tests) {
       ]
 
       deps = [
+        "../modules/audio_processing:api",
         "../modules/audio_processing:audio_processing",
         "../modules/audio_processing:audioproc_f_impl",
       ]
diff --git a/audio/BUILD.gn b/audio/BUILD.gn
index 078d6ab0ac..4b2ec6110a 100644
--- a/audio/BUILD.gn
+++ b/audio/BUILD.gn
@@ -72,6 +72,7 @@ rtc_static_library("audio") {
     "../modules/audio_coding:audio_network_adaptor_config",
     "../modules/audio_device",
     "../modules/audio_processing",
+    "../modules/audio_processing:api",
     "../modules/bitrate_controller:bitrate_controller",
     "../modules/pacing:pacing",
     "../modules/remote_bitrate_estimator:remote_bitrate_estimator",
diff --git a/call/BUILD.gn b/call/BUILD.gn
index db82884cfd..c49fc88b7b 100644
--- a/call/BUILD.gn
+++ b/call/BUILD.gn
@@ -38,6 +38,7 @@ rtc_source_set("call_interfaces") {
     "../api/audio_codecs:audio_codecs_api",
     "../api/transport:network_control",
     "../modules/audio_device:audio_device",
+    "../modules/audio_processing:api",
     "../modules/audio_processing:audio_processing",
     "../modules/audio_processing:audio_processing_statistics",
     "../rtc_base:audio_format_to_string",
diff --git a/examples/BUILD.gn b/examples/BUILD.gn
index d136e967d4..cc6db5dda0 100644
--- a/examples/BUILD.gn
+++ b/examples/BUILD.gn
@@ -505,6 +505,7 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
         "../api/audio_codecs:builtin_audio_encoder_factory",
         "../logging:rtc_event_log_impl_base",
         "../media:rtc_audio_video",
+        "../modules/audio_processing:api",
         "../modules/audio_processing:audio_processing",
         "../pc:libjingle_peerconnection",
         "../rtc_base:rtc_base",
@@ -722,6 +723,7 @@ if (is_linux || is_win) {
       "../api/video_codecs:builtin_video_encoder_factory",
       "../media:rtc_audio_video",
       "../modules/audio_device:audio_device",
+      "../modules/audio_processing:api",
       "../modules/audio_processing:audio_processing",
       "../modules/video_capture:video_capture_module",
       "../pc:libjingle_peerconnection",
@@ -845,6 +847,7 @@ if (is_win || is_android) {
       "../media:rtc_media",
       "../media:rtc_media_base",
       "../modules/audio_device:audio_device",
+      "../modules/audio_processing:api",
       "../modules/audio_processing:audio_processing",
       "../modules/video_capture:video_capture_module",
       "../pc:libjingle_peerconnection",
diff --git a/examples/androidnativeapi/BUILD.gn b/examples/androidnativeapi/BUILD.gn
index 5568eb11dd..dc27d75984 100644
--- a/examples/androidnativeapi/BUILD.gn
+++ b/examples/androidnativeapi/BUILD.gn
@@ -53,6 +53,7 @@ if (is_android) {
       "//media:rtc_audio_video",
       "//media:rtc_internal_video_codecs",
       "//modules/audio_processing",
+      "//modules/audio_processing:api",
       "//modules/utility:utility",
       "//pc:libjingle_peerconnection",
       "//rtc_base:rtc_base",
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 8eaa23ce02..85121d28b5 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -278,6 +278,7 @@ rtc_static_library("rtc_audio_video") {
   defines = []
   libs = []
   deps = [
+    "../modules/audio_processing:api",
     "../modules/audio_processing/aec_dump:aec_dump",
     "../modules/video_coding:video_codec_interface",
     "../modules/video_coding:video_coding",
@@ -446,6 +447,7 @@ if (rtc_include_tests) {
       "../call:video_stream_api",
       "../common_video:common_video",
       "../modules/audio_coding:rent_a_codec",
+      "../modules/audio_processing:api",
       "../modules/audio_processing:audio_processing",
       "../modules/rtp_rtcp:rtp_rtcp_format",
       "../modules/video_coding:video_codec_interface",
@@ -541,6 +543,7 @@ if (rtc_include_tests) {
       "../api/test/video:function_video_factory",
       "../api/units:time_delta",
       "../api/video:video_frame_i420",
+      "../modules/audio_processing:api",
       "../modules/audio_processing:mocks",
       "../modules/rtp_rtcp",
       "../modules/video_coding:video_codec_interface",
diff --git a/modules/audio_mixer/BUILD.gn b/modules/audio_mixer/BUILD.gn
index 0bb3ae137a..fb8bfa6737 100644
--- a/modules/audio_mixer/BUILD.gn
+++ b/modules/audio_mixer/BUILD.gn
@@ -48,6 +48,7 @@ rtc_static_library("audio_mixer_impl") {
     "../../system_wrappers",
     "../../system_wrappers:metrics",
     "../audio_processing",
+    "../audio_processing:api",
     "../audio_processing:apm_logging",
     "../audio_processing:audio_frame_view",
     "../audio_processing/agc2:fixed_digital",
diff --git a/modules/audio_processing/BUILD.gn b/modules/audio_processing/BUILD.gn
index 53744b8ee1..a244c84400 100644
--- a/modules/audio_processing/BUILD.gn
+++ b/modules/audio_processing/BUILD.gn
@@ -38,13 +38,27 @@ rtc_static_library("config") {
   ]
 }
 
-# Temporary dummy target for the APM interface.
 rtc_source_set("api") {
   visibility = [ "*" ]
-
-  # TODO(bugs.webrtc.org/9535): Adapt downstream projects and populate.
-  sources = []
-  deps = []
+  sources = [
+    "include/audio_processing.cc",
+    "include/audio_processing.h",
+  ]
+  deps = [
+    ":audio_frame_view",
+    ":audio_generator_interface",
+    ":audio_processing_statistics",
+    ":config",
+    ":gain_control_interface",
+    "../../api/audio:aec3_config",
+    "../../api/audio:echo_control",
+    "../../rtc_base:deprecation",
+    "../../rtc_base:macromagic",
+    "../../rtc_base:ptr_util",
+    "../../rtc_base:rtc_base_approved",
+    "../../rtc_base/system:rtc_export",
+    "//third_party/abseil-cpp/absl/types:optional",
+  ]
 }
 
 rtc_static_library("audio_processing") {
@@ -76,11 +90,6 @@ rtc_static_library("audio_processing") {
     "gain_controller2.h",
     "include/aec_dump.cc",
     "include/aec_dump.h",
-
-    # TODO(bugs.webrtc.org/9535): Adapt downstream projects and remove
-    # include/audio_processing.cc/h.
-    "include/audio_processing.cc",
-    "include/audio_processing.h",
     "level_estimator_impl.cc",
     "level_estimator_impl.h",
     "low_cut_filter.cc",
@@ -333,6 +342,7 @@ if (rtc_include_tests) {
       "include/mock_audio_processing.h",
     ]
     deps = [
+      ":api",
       ":audio_processing",
       ":audio_processing_statistics",
       "../../test:test_support",
@@ -511,6 +521,7 @@ if (rtc_include_tests) {
     ]
 
     deps = [
+      ":api",
       ":audio_generator_factory",
       ":audio_processing",
       ":file_audio_generator",
@@ -555,6 +566,7 @@ if (rtc_include_tests) {
 
       deps = [
         ":analog_mic_simulation",
+        ":api",
         ":apm_logging",
         ":audio_processing",
         ":audioproc_debug_proto",
@@ -585,6 +597,7 @@ if (rtc_include_tests) {
         "test/audioproc_float_main.cc",
       ]
       deps = [
+        ":api",
         ":audio_processing",
         "../../api:audioproc_f_api",
         "../../rtc_base:rtc_base_approved",
@@ -610,6 +623,7 @@ if (rtc_include_tests) {
     ]
 
     deps = [
+      ":api",
       ":audio_processing",
       "../../api:array_view",
       "../../api/audio:audio_frame_api",
@@ -694,6 +708,7 @@ if (rtc_include_tests) {
       ]
 
       deps = [
+        ":api",
         ":audio_processing",
         ":audioproc_debug_proto",
         ":audioproc_protobuf_utils",
diff --git a/modules/audio_processing/aec_dump/BUILD.gn b/modules/audio_processing/aec_dump/BUILD.gn
index 5b5552637c..d4262ca485 100644
--- a/modules/audio_processing/aec_dump/BUILD.gn
+++ b/modules/audio_processing/aec_dump/BUILD.gn
@@ -43,6 +43,7 @@ rtc_source_set("mock_aec_dump_unittests") {
 
   deps = [
     ":mock_aec_dump",
+    "..:api",
     "../",
     "../../../rtc_base:rtc_base_approved",
     "//testing/gtest",
diff --git a/pc/BUILD.gn b/pc/BUILD.gn
index 7663f8b2f2..2001fbb587 100644
--- a/pc/BUILD.gn
+++ b/pc/BUILD.gn
@@ -258,6 +258,7 @@ rtc_static_library("create_pc_factory") {
     "../media:rtc_audio_video",
     "../media:rtc_media_base",
     "../modules/audio_device:audio_device",
+    "../modules/audio_processing:api",
     "../modules/audio_processing:audio_processing",
     "../rtc_base:rtc_base",
     "../rtc_base:rtc_base_approved",
@@ -424,6 +425,7 @@ if (rtc_include_tests) {
       "../media:rtc_media_base",
       "../media:rtc_media_tests_utils",
       "../modules/audio_device:audio_device",
+      "../modules/audio_processing:api",
       "../modules/audio_processing:audio_processing",
       "../p2p:p2p_test_utils",
       "../rtc_base:checks",
@@ -539,6 +541,7 @@ if (rtc_include_tests) {
       "../media:rtc_data",  # TODO(phoglund): AFAIK only used for one sctp constant.
       "../media:rtc_media_base",
       "../media:rtc_media_tests_utils",
+      "../modules/audio_processing:api",
       "../modules/audio_processing:audio_processing",
       "../modules/utility:utility",
       "../p2p:p2p_test_utils",
diff --git a/sdk/BUILD.gn b/sdk/BUILD.gn
index 98de1a3006..31a7901acb 100644
--- a/sdk/BUILD.gn
+++ b/sdk/BUILD.gn
@@ -919,6 +919,7 @@ if (is_ios || is_mac) {
         "../media:rtc_media_base",
         "../modules:module_api",
         "../modules/audio_device:audio_device_api",
+        "../modules/audio_processing:api",
         "../modules/audio_processing:audio_processing",
         "../modules/video_coding:video_codec_interface",
         "../pc:create_pc_factory",
@@ -1188,6 +1189,7 @@ if (is_ios || is_mac) {
           "../media:rtc_media_base",
           "../modules:module_api",
           "../modules/audio_device:audio_device_api",
+          "../modules/audio_processing:api",
           "../modules/audio_processing:audio_processing",
           "../modules/video_coding:video_codec_interface",
           "../rtc_base:rtc_base_tests_utils",
diff --git a/sdk/android/BUILD.gn b/sdk/android/BUILD.gn
index fff8dc3785..d5df5ad835 100644
--- a/sdk/android/BUILD.gn
+++ b/sdk/android/BUILD.gn
@@ -561,6 +561,7 @@ if (is_android) {
       ":builtin_audio_codecs_jni",
       "../../api/audio_codecs:builtin_audio_decoder_factory",
       "../../api/audio_codecs:builtin_audio_encoder_factory",
+      "../../modules/audio_processing:api",
       "../../modules/audio_processing:audio_processing",
       "../../rtc_base:rtc_base_approved",
     ]
@@ -1011,6 +1012,7 @@ if (is_android) {
       "../../logging:rtc_event_log_api",
       "../../media:rtc_audio_video",
       "../../modules/audio_device:audio_device",
+      "../../modules/audio_processing:api",
       "../../modules/audio_processing:audio_processing",
     ]
   }
@@ -1491,6 +1493,7 @@ if (is_android) {
       "../../media:rtc_media_base",
       "../../modules/audio_device:audio_device",
       "../../modules/audio_device:mock_audio_device",
+      "../../modules/audio_processing:api",
       "../../modules/audio_processing:audio_processing",
       "../../modules/utility:utility",
       "../../pc:libjingle_peerconnection",
diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index ae264209f0..1909c8a902 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -469,6 +469,7 @@ rtc_static_library("audio_processing_fuzzer_helper") {
     ":fuzz_data_helper",
     "../../api/audio:audio_frame_api",
     "../../modules/audio_processing",
+    "../../modules/audio_processing:api",
     "../../rtc_base:checks",
     "../../rtc_base:rtc_base_approved",
     "//third_party/abseil-cpp/absl/types:optional",
@@ -483,6 +484,7 @@ webrtc_fuzzer_test("audio_processing_fuzzer") {
     ":audio_processing_fuzzer_helper",
     "../../api/audio:aec3_factory",
     "../../modules/audio_processing",
+    "../../modules/audio_processing:api",
     "../../modules/audio_processing/aec3",
     "../../modules/audio_processing/aec_dump",
     "../../modules/audio_processing/aec_dump:aec_dump_impl",
@@ -503,6 +505,7 @@ webrtc_fuzzer_test("agc_fuzzer") {
   deps = [
     ":fuzz_data_helper",
     "../../modules/audio_processing",
+    "../../modules/audio_processing:api",
     "../../rtc_base:rtc_base_approved",
     "../../rtc_base:safe_minmax",
     "//third_party/abseil-cpp/absl/memory",