media: Introduce Renderer interface and RendererImpl.

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 68d745745f57330f532a3b61ba5b57e002175e4b..d1d854273d139c0d1d73feaf62ea3a7b1b99af52 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -156,6 +156,8 @@ component("media") {
     "base/player_tracker.h",
     "base/ranges.cc",
     "base/ranges.h",
+    "base/renderer.cc",
+    "base/renderer.h",
     "base/sample_format.cc",
     "base/sample_format.h",
     "base/scoped_histogram_timer.h",
@@ -251,6 +253,8 @@ component("media") {
     "filters/h264_bit_reader.h",
     "filters/h264_parser.cc",
     "filters/h264_parser.h",
+    "filters/renderer_impl.cc",
+    "filters/renderer_impl.h",
     "filters/skcanvas_video_renderer.cc",
     "filters/skcanvas_video_renderer.h",
     "filters/source_buffer_platform.cc",
@@ -698,6 +702,7 @@ test("media_unittests") {
     "filters/frame_processor_unittest.cc",
     "filters/h264_bit_reader_unittest.cc",
     "filters/h264_parser_unittest.cc",
+    "filters/renderer_impl_unittest.cc",
     "filters/skcanvas_video_renderer_unittest.cc",
     "filters/source_buffer_stream_unittest.cc",
     "filters/video_decoder_selector_unittest.cc",