Add still image capture interface for VideoCaptureDevice.

media/video/capture/video_capture_device.cc

 // Copyright 2013 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 "media/video/capture/video_capture_device.h"
 
 #include "base/i18n/timezone.h"
 #include "base/strings/string_util.h"
 
 namespace media {
@@ skipping 58 matching lines @@
       "PW", "SA", "SR", "SV", "TT", "TW", "UM", "US", "VG", "VI", "VE"};
   const char** countries_using_60Hz_end =
       countries_using_60Hz + arraysize(countries_using_60Hz);
   if (std::find(countries_using_60Hz, countries_using_60Hz_end,
                 current_country) == countries_using_60Hz_end) {
     return kPowerLine50Hz;
   }
   return kPowerLine60Hz;
 }
 
+void VideoCaptureDevice::InitializeImageCapture(
+    const ImageCaptureFormat& image_format,
+    scoped_ptr<ImageClient> client) {
+  client->OnError("Not supported");

[wuchengli, 2014/09/09 05:53:21]

The client can know if image capture is supported by
GetDeviceSupportedImageFormats. I think we can just have an empty implementation
like CloseImageCapture and CaptureImage. If you want to  call OnError, the other
two functions should call OnError, too.

[Owen Lin, 2014/09/11 06:17:59]

Good point.

+}
+
 }  // namespace media