Add VideoCaptureDevice::GetDeviceSupportedFormats to interface + implementation for Linux and Fake

media/video/capture/linux/video_capture_device_linux.h

 // 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.
 
 // Linux specific implementation of VideoCaptureDevice.
 // V4L2 is used for capturing. V4L2 does not provide its own thread for
 // capturing so this implementation uses a Chromium thread for fetching frames
 // from V4L2.
 
 #ifndef MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
@@ skipping 12 matching lines @@
   explicit VideoCaptureDeviceLinux(const Name& device_name);
   virtual ~VideoCaptureDeviceLinux();
 
   // VideoCaptureDevice implementation.
   virtual void Allocate(const VideoCaptureCapability& capture_format,
                          EventHandler* observer) OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void DeAllocate() OVERRIDE;
   virtual const Name& device_name() OVERRIDE;
+  virtual void GetDeviceSupportedFormats(
+      scoped_ptr<EventHandler> client) OVERRIDE;
 
  private:
   enum InternalState {
     kIdle,  // The device driver is opened but camera is not in use.
     kAllocated,  // The camera has been allocated and can be started.
     kCapturing,  // Video is being captured.
     kError  // Error accessing HW functions.
             // User needs to recover by destroying the object.
   };
 
   // Buffers used to receive video frames from with v4l2.
   struct Buffer {
     Buffer() : start(0), length(0) {}
     void* start;
     size_t length;
   };
 
   // Called on the v4l2_thread_.
   void OnAllocate(int width,
                   int height,
                   int frame_rate,
                   EventHandler* observer);
   void OnStart();
   void OnStop();
   void OnDeAllocate();
   void OnCaptureTask();
+  void OnGetDeviceSupportedFormats(EventHandler* observer);
 
   bool AllocateVideoBuffers();
   void DeAllocateVideoBuffers();
   void SetErrorState(const std::string& reason);
 
   InternalState state_;
   VideoCaptureDevice::EventHandler* observer_;
   Name device_name_;
   int device_fd_;  // File descriptor for the opened camera device.
   base::Thread v4l2_thread_;  // Thread used for reading data from the device.
   Buffer* buffer_pool_;
   int buffer_pool_size_;  // Number of allocated buffers.
   int timeout_count_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_