getUserMeida: report device starting states

content/browser/renderer_host/media/video_capture_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 
@@ skipping 20 matching lines @@
 #include "media/audio/mock_audio_manager.h"
 #include "media/base/media_switches.h"
 #include "media/capture/video_capture_types.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "net/url_request/url_request_context.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AnyNumber;
+using ::testing::AtMost;
 using ::testing::DoAll;
 using ::testing::InSequence;
 using ::testing::Mock;
 using ::testing::Return;
 using ::testing::SaveArg;
 using ::testing::StrictMock;
 
 namespace content {
 
 namespace {
@@ skipping 186 matching lines @@
   void StartAndImmediateStopCapture() {
     // Quickly start and then stop capture, without giving much chance for
     // asynchronous capture operations to produce frames.
     InSequence s;
     base::RunLoop run_loop;
 
     media::VideoCaptureParams params;
     params.requested_format = media::VideoCaptureFormat(
         gfx::Size(352, 288), 30, media::PIXEL_FORMAT_I420);
 
-    EXPECT_CALL(*this, OnStateChanged(mojom::VideoCaptureState::STARTED));
+    // |STARTED| is reported asynchronously, which may not be got if capture

[dcheng, 2017/02/25 07:27:03]

Nit: got => received or got => called

Ditto elsewhere

[braveyao, 2017/02/27 23:18:53]

Done.

+    // is stopped immediately.
+    EXPECT_CALL(*this, OnStateChanged(mojom::VideoCaptureState::STARTED))
+        .Times(AtMost(1));
     host_->Start(kDeviceId, opened_session_id_, params,
                  observer_binding_.CreateInterfacePtrAndBind());
 
     EXPECT_CALL(*this, OnStateChanged(mojom::VideoCaptureState::STOPPED));
     host_->Stop(kDeviceId);
     run_loop.RunUntilIdle();
   }
 
   void PauseResumeCapture() {
     InSequence s;
@@ skipping 100 matching lines @@
   StartCapture();
 
   // When the session is closed via the stream without stopping capture, the
   // ENDED event is sent.
   EXPECT_CALL(*this, OnStateChanged(mojom::VideoCaptureState::ENDED));
   CloseSession();
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace content