Propagate MediaStreamTrack video content hints.

content/renderer/media/webrtc/webrtc_video_capturer_adapter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #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 {
 
 // WebRtcVideoCapturerAdapter implements a simple cricket::VideoCapturer that is
 // used for VideoCapturing in libJingle and especially in PeerConnections.
 // The class is created and destroyed on the main render thread.
 // PeerConnection access cricket::VideoCapturer from a libJingle worker thread.
 // An instance of WebRtcVideoCapturerAdapter is owned by an instance of
 // webrtc::VideoTrackSourceInterface in libJingle. The implementation of
 // webrtc::VideoTrackSourceInterface guarantees that this object is not deleted
 // while it is still used in libJingle.
 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
   // libjingles worker thread.
   // 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.
   cricket::CaptureState Start(
       const cricket::VideoFormat& capture_format) override;
   void Stop() override;
   bool IsRunning() override;
   bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) override;
   bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
                             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_;
 
   // |thread_checker_| is bound to the libjingle worker thread.
   base::ThreadChecker thread_checker_;
 
   const bool is_screencast_;
+  blink::WebMediaStreamTrack::ContentHintType content_hint_;
   bool running_;
 
   media::VideoFramePool scaled_frame_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcVideoCapturerAdapter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_