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

media/video/capture/fake_video_capture_device.cc

Index: media/video/capture/fake_video_capture_device.cc
diff --git a/media/video/capture/fake_video_capture_device.cc b/media/video/capture/fake_video_capture_device.cc
index 8434bc3ebbe67b5c6e865657cecfdee39da82dd4..b8b4a241259b5714c34d7876578aa55ac48015c4 100644
--- a/media/video/capture/fake_video_capture_device.cc
+++ b/media/video/capture/fake_video_capture_device.cc
@@ -149,6 +149,21 @@ const VideoCaptureDevice::Name& FakeVideoCaptureDevice::device_name() {
   return device_name_;
 }
 
+void FakeVideoCaptureDevice::GetDeviceSupportedFormats(
+    const std::string& device_name,
+    VideoCaptureFormats* capture_formats) {
+  media::VideoCaptureCapability capture_format;
+  capture_format.color = media::PIXEL_FORMAT_I420;
+  capture_format.width = 640;
+  capture_format.height = 480;
+  capture_format.frame_rate = GetFrameRate();
+  capture_formats->insert(capture_formats->end(), capture_format);
+}
+
+int FakeVideoCaptureDevice::GetFrameRate() const {
+  return (1000 / kFakeCaptureTimeoutMs);
+}
+
 void FakeVideoCaptureDevice::OnCaptureTask() {
   if (state_ != kCapturing) {
     return;
@@ -253,5 +268,4 @@ void FakeVideoCaptureDevice::PopulateCapabilitiesRoster() {
 
   capabilities_roster_index_ = 0;
 }
-
 }  // namespace media