Add still image capture interface for VideoCaptureDevice.

media/video/capture/video_capture_device_factory.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_H_
 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_H_
 
 #include "base/threading/thread_checker.h"
 #include "media/video/capture/video_capture_device.h"
 
@@ skipping 20 matching lines @@
       void(scoped_ptr<media::VideoCaptureDevice::Names>)>& callback);
 
   // Gets the supported formats of a particular device attached to the system.
   // This method should be called before allocating or starting a device. In
   // case format enumeration is not supported, or there was a problem, the
   // formats array will be empty.
   virtual void GetDeviceSupportedFormats(
       const VideoCaptureDevice::Name& device,
       VideoCaptureFormats* supported_formats) = 0;
 
+  // Gets the supported formats for still image of a particular device attached
+  // to the system. In case format enumeration is not supported, or there was
+  // a problem, the formats array will be empty.
+  virtual void GetDeviceSupportedImageFormats(
+      const VideoCaptureDevice::Name& device,
+      ImageCaptureFormats* supported_formats) {}
+
  protected:
   // Gets the names of all video capture devices connected to this computer.
   // Used by the default implementation of EnumerateDeviceNames().
   virtual void GetDeviceNames(VideoCaptureDevice::Names* device_names) = 0;
 
   base::ThreadChecker thread_checker_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_H_