Add still image capture interface for VideoCaptureDevice.

media/video/capture/video_capture_types.cc

Index: media/video/capture/video_capture_types.cc
diff --git a/media/video/capture/video_capture_types.cc b/media/video/capture/video_capture_types.cc
index ce5c354e290eed22fef06f69a067b4cf2d01265c..7201e572abd37c6bd550d17cf32d9d663bc823cb 100644
--- a/media/video/capture/video_capture_types.cc
+++ b/media/video/capture/video_capture_types.cc
@@ -69,4 +69,13 @@ std::string VideoCaptureFormat::PixelFormatToString(VideoPixelFormat format) {
 
 VideoCaptureParams::VideoCaptureParams()
     : resolution_change_policy(RESOLUTION_POLICY_FIXED) {}
+
+ImageCaptureFormat::ImageCaptureFormat() : pixel_format(PIXEL_FORMAT_UNKNOWN) {
+}
+
+ImageCaptureFormat::ImageCaptureFormat(const gfx::Size& frame_size,
+                                       VideoPixelFormat pixel_format)
+    : frame_size(frame_size), pixel_format(pixel_format) {
+}
+
 }  // namespace media