Add the frame provider base class used in cast media.

chromecast/media/cma/base/coded_frame_provider.cc

Index: chromecast/media/cma/base/coded_frame_provider.cc
diff --git a/chromecast/media/cma/base/media_task_runner.cc b/chromecast/media/cma/base/coded_frame_provider.cc
similarity index 64%
copy from chromecast/media/cma/base/media_task_runner.cc
copy to chromecast/media/cma/base/coded_frame_provider.cc
index 5b5423bbdf1cebbe2d38b536edeab29c0a40ed00..56e461cfd8d0595d15fc522948c5a64cb71a50d2 100644
--- a/chromecast/media/cma/base/media_task_runner.cc
+++ b/chromecast/media/cma/base/coded_frame_provider.cc
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chromecast/media/cma/base/media_task_runner.h"
+#include "chromecast/media/cma/base/coded_frame_provider.h"
 
 namespace chromecast {
 namespace media {
 
-MediaTaskRunner::MediaTaskRunner() {
+CodedFrameProvider::CodedFrameProvider() {
 }
 
-MediaTaskRunner::~MediaTaskRunner() {
+CodedFrameProvider::~CodedFrameProvider() {
 }
 
 }  // namespace media