Media Stream Image Capture (4): wire takePhoto and implement in FakeVCDevice

content/browser/renderer_host/media/video_capture_manager.h

Index: content/browser/renderer_host/media/video_capture_manager.h
diff --git a/content/browser/renderer_host/media/video_capture_manager.h b/content/browser/renderer_host/media/video_capture_manager.h
index 6e3e9561febd133f479697ee6efbf52218cea96b..93df0ab9bfe1b9eeda388e19e354d129bf7bfa03 100644
--- a/content/browser/renderer_host/media/video_capture_manager.h
+++ b/content/browser/renderer_host/media/video_capture_manager.h
@@ -156,6 +156,11 @@ class CONTENT_EXPORT VideoCaptureManager : public MediaStreamProvider {
   scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner() {
     return device_task_runner_;
   }
+
+  bool TakePhoto(
+      int session_id,

[miu, 2016/05/04 23:45:50]

Following up on my comment above, can this take a device_id instead of a
session_id?

[mcasas, 2016/05/05 00:57:12]

See above: unfortunately, |device_id| is a different thing for 
MSM and for VCM.

+      const media::VideoCaptureDevice::TakePhotoCallback& photo_callback);
+
  private:
   ~VideoCaptureManager() override;
   class DeviceEntry;