AVDACodecImages keep a reference to the SurfaceTexture backing them

content/common/gpu/media/android_deferred_rendering_backing_strategy.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_ANDROID_DEFERRED_RENDERING_BACKING_STRATEGY_H_
 #define CONTENT_COMMON_GPU_MEDIA_ANDROID_DEFERRED_RENDERING_BACKING_STRATEGY_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/media/android_video_decode_accelerator.h"
 
 namespace gl {
 class GLImage;
 }
 
 namespace gpu {
 namespace gles2 {
 class TextureRef;
 }
 }
 
 namespace content {
 
 class AVDACodecImage;
 class AVDASharedState;
 
 // A BackingStrategy implementation that defers releasing codec buffers until
-// a PictureBuffer's texture is used to draw, then draws using the surface
-// texture's front buffer rather than a copy.  To do this, it uses a GLImage
-// implementation to talk to MediaCodec.
+// a PictureBuffer's texture is used to draw. To do this it backs PictureBuffers
+// with AVDACodecImages, which talk to MediaCodec to organize the display of the
+// right frame. It can render to either a SurfaceTexture or SurfaceView Surface.
 class CONTENT_EXPORT AndroidDeferredRenderingBackingStrategy
     : public AndroidVideoDecodeAccelerator::BackingStrategy {
  public:
   explicit AndroidDeferredRenderingBackingStrategy(
       AVDAStateProvider* state_provider);
   ~AndroidDeferredRenderingBackingStrategy() override;
 
   // AndroidVideoDecodeAccelerator::BackingStrategy
   gfx::ScopedJavaSurface Initialize(int surface_view_id) override;
   void Cleanup(bool have_context,
@@ skipping 33 matching lines @@
   scoped_refptr<gfx::SurfaceTexture> surface_texture_;
 
   media::VideoCodecBridge* media_codec_;
 
   DISALLOW_COPY_AND_ASSIGN(AndroidDeferredRenderingBackingStrategy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_ANDROID_DEFERRED_RENDERING_BACKING_STRATEGY_H_