Export symbols needed by the Chromium component build (part 7).

This CL uses RTC_EXPORT (defined in rtc_base/system/rtc_export.h)
to mark WebRTC symbols as visible from a shared library, this doesn't
mean these symbols are part of the public API (please continue to refer
to [1] for info about what is considered public WebRTC API).

[1] - https://webrtc.googlesource.com/src/+/HEAD/native-api.md

Bug: webrtc:9419
Change-Id: I1081af5ecf7ba55a7415e09e45357b783cf300aa
Reviewed-on: https://webrtc-review.googlesource.com/c/107708
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25358}

api/video/BUILD.gn

@@ -47,6 +47,7 @@ rtc_source_set("video_frame_i420") {
     "../../rtc_base:checks",
     "../../rtc_base:rtc_base",
     "../../rtc_base/memory:aligned_malloc",
+    "../../rtc_base/system:rtc_export",
     "//third_party/libyuv",
   ]
 }

api/video/i420_buffer.h

@@ -18,11 +18,12 @@
 #include "api/video/video_rotation.h"
 #include "rtc_base/memory/aligned_malloc.h"
 #include "rtc_base/scoped_ref_ptr.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
 // Plain I420 buffer in standard memory.
-class I420Buffer : public I420BufferInterface {
+class RTC_EXPORT I420Buffer : public I420BufferInterface {
  public:
   static rtc::scoped_refptr<I420Buffer> Create(int width, int height);
   static rtc::scoped_refptr<I420Buffer> Create(int width,

api/video_codecs/video_decoder.h

@@ -26,7 +26,7 @@ namespace webrtc {
 struct CodecSpecificInfo;
 class VideoCodec;
 
-class DecodedImageCallback {
+class RTC_EXPORT DecodedImageCallback {
  public:
   virtual ~DecodedImageCallback() {}
 

pc/webrtcsdp.h

@@ -22,6 +22,8 @@
 
 #include <string>
 
+#include "rtc_base/system/rtc_export.h"
+
 namespace cricket {
 class Candidate;
 }  // namespace cricket
@@ -46,7 +48,8 @@ std::string SdpSerializeCandidate(const IceCandidateInterface& candidate);
 
 // Serializes a cricket Candidate.
 // candidate - The candidate to be serialized.
-std::string SdpSerializeCandidate(const cricket::Candidate& candidate);
+RTC_EXPORT std::string SdpSerializeCandidate(
+    const cricket::Candidate& candidate);
 
 // Deserializes the passed in SDP string to a JsepSessionDescription.
 // message - SDP string to be Deserialized.
@@ -76,10 +79,10 @@ bool SdpDeserializeCandidate(const std::string& message,
 // candidate - The cricket Candidate from the SDP string.
 // error - The detail error information when parsing fails.
 // return - true on success, false on failure.
-bool SdpDeserializeCandidate(const std::string& transport_name,
-                             const std::string& message,
-                             cricket::Candidate* candidate,
-                             SdpParseError* error);
+RTC_EXPORT bool SdpDeserializeCandidate(const std::string& transport_name,
+                                        const std::string& message,
+                                        cricket::Candidate* candidate,
+                                        SdpParseError* error);
 
 }  // namespace webrtc
 

stats/BUILD.gn

@@ -40,6 +40,7 @@ rtc_source_set("rtc_stats_test_utils") {
   deps = [
     ":rtc_stats",
     "../api:rtc_stats_api",
+    "../rtc_base/system:rtc_export",
   ]
 }
 

stats/test/rtcteststats.h

@@ -15,10 +15,11 @@
 #include <vector>
 
 #include "api/stats/rtcstats.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
-class RTCTestStats : public RTCStats {
+class RTC_EXPORT RTCTestStats : public RTCStats {
  public:
   WEBRTC_RTCSTATS_DECL();