diff --git a/api/video/hdr_metadata.h b/api/video/hdr_metadata.h
index 3be1d59883..e9001a2c80 100644
--- a/api/video/hdr_metadata.h
+++ b/api/video/hdr_metadata.h
@@ -11,21 +11,14 @@
 #ifndef API_VIDEO_HDR_METADATA_H_
 #define API_VIDEO_HDR_METADATA_H_
 
-#include <stdint.h>
-
 namespace webrtc {
 
 // SMPTE ST 2086 mastering metadata,
 // see https://ieeexplore.ieee.org/document/8353899.
 struct HdrMasteringMetadata {
   struct Chromaticity {
-    // xy chromaticity coordinates must be calculated as specified in ISO
-    // 11664-3:2012 Section 7, and must be specified with four decimal places.
-    // The x coordinate should be in the range [0.0001, 0.7400] and the y
-    // coordinate should be in the range [0.0001, 0.8400]. Valid range [0.0000,
-    // 1.0000].
-    float x = 0.0f;
-    float y = 0.0f;
+    Chromaticity();
+
     bool operator==(const Chromaticity& rhs) const {
       return x == rhs.x && y == rhs.y;
     }
@@ -34,9 +27,31 @@ struct HdrMasteringMetadata {
       return x >= 0.0 && x <= 1.0 && y >= 0.0 && y <= 1.0;
     }
 
-    Chromaticity();
+    // xy chromaticity coordinates must be calculated as specified in ISO
+    // 11664-3:2012 Section 7, and must be specified with four decimal places.
+    // The x coordinate should be in the range [0.0001, 0.7400] and the y
+    // coordinate should be in the range [0.0001, 0.8400]. Valid range [0.0000,
+    // 1.0000].
+    float x = 0.0f;
+    float y = 0.0f;
   };
 
+  HdrMasteringMetadata();
+
+  bool operator==(const HdrMasteringMetadata& rhs) const {
+    return ((primary_r == rhs.primary_r) && (primary_g == rhs.primary_g) &&
+            (primary_b == rhs.primary_b) && (white_point == rhs.white_point) &&
+            (luminance_max == rhs.luminance_max) &&
+            (luminance_min == rhs.luminance_min));
+  }
+
+  bool Validate() const {
+    return luminance_max >= 0.0 && luminance_max <= 20000.0 &&
+           luminance_min >= 0.0 && luminance_min <= 5.0 &&
+           primary_r.Validate() && primary_g.Validate() &&
+           primary_b.Validate() && white_point.Validate();
+  }
+
   // The nominal primaries of the mastering display.
   Chromaticity primary_r;
   Chromaticity primary_g;
@@ -54,36 +69,12 @@ struct HdrMasteringMetadata {
   // in the unit candela/m2. The value should be in the range [0.0001, 5.0000]
   // with four decimal places. Valid range [0.0000, 5.0000].
   float luminance_min = 0.0f;
-
-  HdrMasteringMetadata();
-
-  bool operator==(const HdrMasteringMetadata& rhs) const {
-    return ((primary_r == rhs.primary_r) && (primary_g == rhs.primary_g) &&
-            (primary_b == rhs.primary_b) && (white_point == rhs.white_point) &&
-            (luminance_max == rhs.luminance_max) &&
-            (luminance_min == rhs.luminance_min));
-  }
-
-  bool Validate() const {
-    return luminance_max >= 0.0 && luminance_max <= 20000.0 &&
-           luminance_min >= 0.0 && luminance_min <= 5.0 &&
-           primary_r.Validate() && primary_g.Validate() &&
-           primary_b.Validate() && white_point.Validate();
-  }
 };
 
 // High dynamic range (HDR) metadata common for HDR10 and WebM/VP9-based HDR
 // formats. This struct replicates the HDRMetadata struct defined in
 // https://cs.chromium.org/chromium/src/media/base/hdr_metadata.h
 struct HdrMetadata {
-  HdrMasteringMetadata mastering_metadata;
-  // Max content light level (CLL), i.e. maximum brightness level present in the
-  // stream, in nits. 1 nit = 1 candela/m2. Valid range [0, 20000].
-  int max_content_light_level = 0;
-  // Max frame-average light level (FALL), i.e. maximum average brightness of
-  // the brightest frame in the stream, in nits. Valid range [0, 20000].
-  int max_frame_average_light_level = 0;
-
   HdrMetadata();
 
   bool operator==(const HdrMetadata& rhs) const {
@@ -99,6 +90,14 @@ struct HdrMetadata {
            max_frame_average_light_level <= 20000 &&
            mastering_metadata.Validate();
   }
+
+  HdrMasteringMetadata mastering_metadata;
+  // Max content light level (CLL), i.e. maximum brightness level present in the
+  // stream, in nits. 1 nit = 1 candela/m2. Valid range [0, 20000].
+  int max_content_light_level = 0;
+  // Max frame-average light level (FALL), i.e. maximum average brightness of
+  // the brightest frame in the stream, in nits. Valid range [0, 20000].
+  int max_frame_average_light_level = 0;
 };
 
 }  // namespace webrtc