Spec compliant video constraints for getUserMedia behind flag.

content/renderer/media/media_stream_video_capturer_source.h

Index: content/renderer/media/media_stream_video_capturer_source.h
diff --git a/content/renderer/media/media_stream_video_capturer_source.h b/content/renderer/media/media_stream_video_capturer_source.h
index 14c1fb3a1a1cd9184a2a0b1453ee7bc34be27e2b..8161949241efb71db83dda4d8ca61655612c32b4 100644
--- a/content/renderer/media/media_stream_video_capturer_source.h
+++ b/content/renderer/media/media_stream_video_capturer_source.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
 
+#include <memory>
+
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ -30,9 +32,15 @@ class CONTENT_EXPORT MediaStreamVideoCapturerSource
   MediaStreamVideoCapturerSource(
       const SourceStoppedCallback& stop_callback,
       std::unique_ptr<media::VideoCapturerSource> source);
+  // TODO(guidou): Remove this constructor. http://crbug.com/706408
   MediaStreamVideoCapturerSource(const SourceStoppedCallback& stop_callback,
                                  const StreamDeviceInfo& device_info,
                                  RenderFrame* render_frame);
+  MediaStreamVideoCapturerSource(
+      const SourceStoppedCallback& stop_callback,
+      const StreamDeviceInfo& device_info,
+      const media::VideoCaptureParams& capture_params,
+      RenderFrame* render_frame);
   ~MediaStreamVideoCapturerSource() override;
 
  private:
@@ -53,6 +61,8 @@ class CONTENT_EXPORT MediaStreamVideoCapturerSource
       const blink::WebMediaConstraints& constraints,
       const VideoCaptureDeliverFrameCB& frame_callback) override;
   void StopSourceImpl() override;
+  base::Optional<media::VideoCaptureFormat> GetCurrentFormatImpl()
+      const override;
 
   // RenderFrameObserver implementation.
   void OnDestruct() final {}
@@ -70,6 +80,8 @@ class CONTENT_EXPORT MediaStreamVideoCapturerSource
   // is completed.
   bool is_capture_starting_ = false;
 
+  media::VideoCaptureParams capture_params_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoCapturerSource);
 };