Add frame refresh to VideoCaptureDevice, and buffer pool resurrection.

media/capture/video/fake_video_capture_device_unittest.cc

Index: media/capture/video/fake_video_capture_device_unittest.cc
diff --git a/media/capture/video/fake_video_capture_device_unittest.cc b/media/capture/video/fake_video_capture_device_unittest.cc
index eff85fc41e18f9191f4d3e1243d913ee44a85eb2..a33eb3f22fe58de02f199f79bac04e75f0221694 100644
--- a/media/capture/video/fake_video_capture_device_unittest.cc
+++ b/media/capture/video/fake_video_capture_device_unittest.cc
@@ -101,7 +101,12 @@ class MockClient : public VideoCaptureDevice::Client {
                               PIXEL_FORMAT_I420);
     frame_cb_.Run(format);
   }
-
+  scoped_ptr<Buffer> ResurrectLastOutputBuffer(
+      const gfx::Size& dimensions,
+      media::VideoPixelFormat format,
+      media::VideoPixelStorage storage) {
+    return scoped_ptr<Buffer>();
+  }
   double GetBufferPoolUtilization() const override { return 0.0; }
 
  private: