Propagate MediaStreamTrack video content hints.

content/renderer/media/webrtc/webrtc_video_capturer_adapter.h

Index: content/renderer/media/webrtc/webrtc_video_capturer_adapter.h
diff --git a/content/renderer/media/webrtc/webrtc_video_capturer_adapter.h b/content/renderer/media/webrtc/webrtc_video_capturer_adapter.h
index 41a3563f3972a888dd0535fa9bccf41dda9beb33..d3f1c7c2e656da7eddd6e61d0f08f2aabd8c3d6e 100644
--- a/content/renderer/media/webrtc/webrtc_video_capturer_adapter.h
+++ b/content/renderer/media/webrtc/webrtc_video_capturer_adapter.h
@@ -16,6 +16,7 @@
 #include "media/base/video_frame.h"
 #include "media/base/video_frame_pool.h"
 #include "media/capture/video_capture_types.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/webrtc/media/base/videocapturer.h"
 
 namespace content {
@@ -31,7 +32,9 @@ namespace content {
 class CONTENT_EXPORT WebRtcVideoCapturerAdapter
     : NON_EXPORTED_BASE(public cricket::VideoCapturer) {
  public:
-  explicit WebRtcVideoCapturerAdapter(bool is_screencast);
+  WebRtcVideoCapturerAdapter(
+      bool is_screencast,
+      blink::WebMediaStreamTrack::ContentHintType content_hint);
   ~WebRtcVideoCapturerAdapter() override;
 
   // OnFrameCaptured delivers video frames to libjingle. It must be called on
@@ -39,6 +42,8 @@ class CONTENT_EXPORT WebRtcVideoCapturerAdapter
   // This method is virtual for testing purposes.
   virtual void OnFrameCaptured(const scoped_refptr<media::VideoFrame>& frame);
 
+  void SetContentHint(blink::WebMediaStreamTrack::ContentHintType content_hint);
+
  private:
   // cricket::VideoCapturer implementation.
   // These methods are accessed from a libJingle worker thread.
@@ -51,6 +56,8 @@ class CONTENT_EXPORT WebRtcVideoCapturerAdapter
                             cricket::VideoFormat* best_format) override;
   bool IsScreencast() const override;
 
+  bool ShouldAdaptResolution() const;
+
   // Helper class used for copying texture backed frames.
   class TextureFrameCopier;
   const scoped_refptr<TextureFrameCopier> texture_copier_;
@@ -59,6 +66,7 @@ class CONTENT_EXPORT WebRtcVideoCapturerAdapter
   base::ThreadChecker thread_checker_;
 
   const bool is_screencast_;
+  blink::WebMediaStreamTrack::ContentHintType content_hint_;
   bool running_;
 
   media::VideoFramePool scaled_frame_pool_;