Added supported formats caching to VideoCaptureManager.

content/browser/renderer_host/media/video_capture_controller.cc

Index: content/browser/renderer_host/media/video_capture_controller.cc
diff --git a/content/browser/renderer_host/media/video_capture_controller.cc b/content/browser/renderer_host/media/video_capture_controller.cc
index 6f1cbc0fb083faa2c1a2b69b8f9e1fa29479e4f4..418ea443b9bfe92e24e88cc501bb812cd54e52e4 100644
--- a/content/browser/renderer_host/media/video_capture_controller.cc
+++ b/content/browser/renderer_host/media/video_capture_controller.cc
@@ -177,6 +177,10 @@ void VideoCaptureController::AddClient(
            << ", " << session_id
            << ")";
 
+  // If this is the first client added to the controller, cache the parameters.
+  if (!controller_clients_.size())
+    video_capture_format_ = params.requested_format;
+
   // Signal error in case device is already in error state.
   if (state_ == VIDEO_CAPTURE_STATE_ERROR) {
     event_handler->OnError(id);
@@ -253,6 +257,12 @@ void VideoCaptureController::ReturnBuffer(
   buffer_pool_->RelinquishConsumerHold(buffer_id, 1);
 }
 
+const media::VideoCaptureFormat&
+VideoCaptureController::GetVideoCaptureFormat() const {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  return video_capture_format_;
+}
+
 scoped_refptr<media::VideoCaptureDevice::Client::Buffer>
 VideoCaptureController::VideoCaptureDeviceClient::ReserveOutputBuffer(
     media::VideoFrame::Format format,