Add a GpuMemoryBuffer pool that creates hardware backed VideoFrames.

media/renderers/video_renderer_impl.cc

Index: media/renderers/video_renderer_impl.cc
diff --git a/media/renderers/video_renderer_impl.cc b/media/renderers/video_renderer_impl.cc
index 722438681254ddc4fa26a895a6f64e0540c15e68..f47ee18037db540b38629fc6876bb7090bbbaa8b 100644
--- a/media/renderers/video_renderer_impl.cc
+++ b/media/renderers/video_renderer_impl.cc
@@ -21,6 +21,8 @@
 #include "media/base/media_switches.h"
 #include "media/base/pipeline.h"
 #include "media/base/video_frame.h"
+#include "media/renderers/gpu_video_accelerator_factories.h"
+#include "media/video/gpu_memory_buffer_video_frame_pool.h"
 
 namespace media {
 
@@ -43,6 +45,7 @@ VideoRendererImpl::VideoRendererImpl(
     VideoRendererSink* sink,
     ScopedVector<VideoDecoder> decoders,
     bool drop_frames,
+    scoped_refptr<GpuVideoAcceleratorFactories> gpu_factories,

[DaleCurtis, 2015/05/14 00:58:57]

const& ?

[Daniele Castagna, 2015/05/14 17:30:25]

Done.

     const scoped_refptr<MediaLog>& media_log)
     : task_runner_(task_runner),
       use_new_video_renderering_path_(ShouldUseVideoRenderingPath()),
@@ -50,6 +53,8 @@ VideoRendererImpl::VideoRendererImpl(
       sink_started_(false),
       video_frame_stream_(
           new VideoFrameStream(task_runner, decoders.Pass(), media_log)),
+      gpu_memory_buffer_pool_(
+          new GpuMemoryBufferVideoFramePool(task_runner, gpu_factories)),

[DaleCurtis, 2015/05/14 00:58:57]

Do you want this owned by each VideoRendererImpl (one per video tag) or would it
be better if the renderer owned a single pool that frames were served from?

[Daniele Castagna, 2015/05/14 17:30:25]

We were thinking about one per video tag right now. One per renderer would
probably be better to limit the total memory used though.

Should we leave the one pool for renderer in another iteration?

[DaleCurtis, 2015/05/14 18:52:13]

sgtm, but you guys are the experts :)

       low_delay_(false),
       received_end_of_stream_(false),
       rendered_end_of_stream_(false),