Add frame refresh to VideoCaptureDevice, and buffer pool resurrection.

content/browser/media/capture/desktop_capture_device_unittest.cc

Index: content/browser/media/capture/desktop_capture_device_unittest.cc
diff --git a/content/browser/media/capture/desktop_capture_device_unittest.cc b/content/browser/media/capture/desktop_capture_device_unittest.cc
index ec10e73926a1f03dcdcdfea49b3798c61a0c25d6..3dd6bbcb1e10510cc67fddbda43b4fb2a8fe3ba1 100644
--- a/content/browser/media/capture/desktop_capture_device_unittest.cc
+++ b/content/browser/media/capture/desktop_capture_device_unittest.cc
@@ -79,6 +79,7 @@ class MockDeviceClient : public media::VideoCaptureDevice::Client {
   MOCK_METHOD0(DoReserveOutputBuffer, void(void));
   MOCK_METHOD0(DoOnIncomingCapturedBuffer, void(void));
   MOCK_METHOD0(DoOnIncomingCapturedVideoFrame, void(void));
+  MOCK_METHOD0(DoResurrectLastOutputBuffer, void(void));
   MOCK_METHOD2(OnError,
                void(const tracked_objects::Location& from_here,
                     const std::string& reason));
@@ -104,7 +105,15 @@ class MockDeviceClient : public media::VideoCaptureDevice::Client {
       const base::TimeTicks& timestamp) override {
     DoOnIncomingCapturedVideoFrame();
   }
-
+  scoped_ptr<Buffer> ResurrectLastOutputBuffer(
+      const gfx::Size& dimensions,
+      media::VideoPixelFormat format,
+      media::VideoPixelStorage storage) override {
+    EXPECT_TRUE(format == media::PIXEL_FORMAT_I420 &&
+                storage == media::PIXEL_STORAGE_CPU);
+    DoResurrectLastOutputBuffer();
+    return scoped_ptr<Buffer>();
+  }
   double GetBufferPoolUtilization() const override { return 0.0; }
 };