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 17f2d654c6193e697b8dbc9a188bcaa099d4e74d..4ab45650f2a7246a5f92b85cf66a364b133c31a6 100644
--- a/media/video/capture/video_capture_types.cc
+++ b/media/video/capture/video_capture_types.cc
@@ -61,4 +61,12 @@ std::string VideoCaptureFormat::PixelFormatToString(VideoPixelFormat format) {
 
 VideoCaptureParams::VideoCaptureParams() : allow_resolution_change(false) {}
 
+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