getUserMeida: report device starting states

media/capture/video/linux/v4l2_capture_delegate_unittest.cc

 // Copyright 2016 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 <sys/fcntl.h>
 #include <sys/ioctl.h>
 
 #include "base/files/file_enumerator.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 169 matching lines @@
     DoOnIncomingCapturedVideoFrame();
   }
   MOCK_METHOD0(DoOnIncomingCapturedVideoFrame, void(void));
   MOCK_METHOD4(
       ResurrectLastOutputBuffer,
       Buffer(const gfx::Size&, VideoPixelFormat, VideoPixelStorage, int));
   MOCK_METHOD2(OnError,
                void(const tracked_objects::Location& from_here,
                     const std::string& reason));
   MOCK_CONST_METHOD0(GetBufferPoolUtilization, double(void));
+  MOCK_METHOD0(OnStarted, void(void));
 };
 
 class V4L2CaptureDelegateTest : public ::testing::Test {
  public:
   V4L2CaptureDelegateTest()
       : device_descriptor_("Device 0", "/dev/video0"),
         delegate_(new V4L2CaptureDelegate(device_descriptor_,
                                           base::ThreadTaskRunnerHandle::Get(),
                                           50)) {}
   ~V4L2CaptureDelegateTest() override = default;
@@ skipping 25 matching lines @@
 
     base::RunLoop().RunUntilIdle();
   }
 
   // Start and stop capturing, triggering the resetting of user and camera
   // control values.
   {
     std::unique_ptr<MockVideoCaptureDeviceClient> client(
         new MockVideoCaptureDeviceClient());
     MockVideoCaptureDeviceClient* client_ptr = client.get();
+    EXPECT_CALL(*client_ptr, OnStarted());
     delegate_->AllocateAndStart(320 /* width */, 240 /* height */,
                                 10.0 /* frame_rate */, std::move(client));
 
     base::RunLoop run_loop;
     base::Closure quit_closure = run_loop.QuitClosure();
     EXPECT_CALL(*client_ptr, OnIncomingCapturedData(_, _, _, _, _, _, _))
         .Times(1)
         .WillOnce(RunClosure(quit_closure));
     run_loop.Run();
 
     delegate_->StopAndDeAllocate();
     base::RunLoop().RunUntilIdle();
   }
 
   // Reopen the device and verify all user and camera controls should be back to
   // their |default_value|s.
   {
     base::ScopedFD device_fd(
         HANDLE_EINTR(open(device_descriptor_.device_id.c_str(), O_RDWR)));
     ASSERT_TRUE(device_fd.is_valid());
     VerifyUserControlsAreSetToDefaultValues(device_fd.get());
   }
 }
 
 };  // namespace media