getUserMeida: report device starting states

content/browser/media/capture/desktop_capture_device_aura_unittest.cc

Index: content/browser/media/capture/desktop_capture_device_aura_unittest.cc
diff --git a/content/browser/media/capture/desktop_capture_device_aura_unittest.cc b/content/browser/media/capture/desktop_capture_device_aura_unittest.cc
index 8f183081fd5583e1d8267d513767cbfcc1125569..9907e947bb1e14b7aa657fdaf70e41d0246c64f1 100644
--- a/content/browser/media/capture/desktop_capture_device_aura_unittest.cc
+++ b/content/browser/media/capture/desktop_capture_device_aura_unittest.cc
@@ -25,6 +25,7 @@
 
 using ::testing::_;
 using ::testing::AnyNumber;
+using ::testing::AtMost;
 using ::testing::DoAll;
 using ::testing::Expectation;
 using ::testing::InvokeWithoutArgs;
@@ -56,6 +57,7 @@ class MockDeviceClient : public media::VideoCaptureDevice::Client {
   MOCK_METHOD2(OnError,
                void(const tracked_objects::Location& from_here,
                     const std::string& reason));
+  MOCK_METHOD0(OnStarted, void(void));
 
   // Trampoline methods to workaround GMOCK problems with std::unique_ptr<>.
   Buffer ReserveOutputBuffer(const gfx::Size& dimensions,
@@ -155,6 +157,9 @@ TEST_F(DesktopCaptureDeviceAuraTest, StartAndStop) {
 
   std::unique_ptr<MockDeviceClient> client(new MockDeviceClient());
   EXPECT_CALL(*client, OnError(_, _)).Times(0);
+  // |STARTED| is reported asynchronously now, which may not be got if capture

[chfremer, 2017/02/16 01:00:50]

Please remove the word "now".

[braveyao, 2017/02/17 20:37:21]

Done.

+  // is stopped immediately.
+  EXPECT_CALL(*client, OnStarted()).Times(AtMost(1));
 
   media::VideoCaptureParams capture_params;
   capture_params.requested_format.frame_size.SetSize(640, 480);