Store AVDACodecImage list in shared state, cleanup callers.

content/common/gpu/media/avda_codec_image.h

Index: content/common/gpu/media/avda_codec_image.h
diff --git a/content/common/gpu/media/avda_codec_image.h b/content/common/gpu/media/avda_codec_image.h
index 9c8c7f638307c6cff36d6a24a40614b40e4991bc..71baf25ce157fd73fe8aaed2dc3d4e19119a81f0 100644
--- a/content/common/gpu/media/avda_codec_image.h
+++ b/content/common/gpu/media/avda_codec_image.h
@@ -28,10 +28,6 @@ class AVDACodecImage : public gpu::gles2::GLStreamTextureImage {
                  const base::WeakPtr<gpu::gles2::GLES2Decoder>& decoder,
                  const scoped_refptr<gfx::SurfaceTexture>& surface_texture);
 
- protected:
-  ~AVDACodecImage() override;
-
- public:
   // gl::GLImage implementation
   void Destroy(bool have_context) override;
   gfx::Size GetSize() override;
@@ -53,7 +49,6 @@ class AVDACodecImage : public gpu::gles2::GLStreamTextureImage {
   // gpu::gles2::GLStreamTextureMatrix implementation
   void GetTextureMatrix(float xform[16]) override;
 
- public:
   // Decoded buffer index that has the image for us to display.
   void SetMediaCodecBufferIndex(int buffer_index);
 
@@ -64,10 +59,14 @@ class AVDACodecImage : public gpu::gles2::GLStreamTextureImage {
   // Set the size of the current image.
   void SetSize(const gfx::Size& size);
 
+  // Updates the MediaCodec for this image; clears |codec_buffer_index_|.
   void SetMediaCodec(media::MediaCodecBridge* codec);
 
   void SetTexture(gpu::gles2::Texture* texture);
 
+ protected:
+  ~AVDACodecImage() override;
+
  private:
   enum { kInvalidCodecBufferIndex = -1 };