Use GLHelper for glReadPixels and format detection

content/renderer/media/renderer_gpu_video_accelerator_factories.h

Index: content/renderer/media/renderer_gpu_video_accelerator_factories.h
diff --git a/content/renderer/media/renderer_gpu_video_accelerator_factories.h b/content/renderer/media/renderer_gpu_video_accelerator_factories.h
index ffbc0abe6645e873c64c17eda06840a182987b65..167eca8a0c925d116334b1ffcadf72ae7487a032 100644
--- a/content/renderer/media/renderer_gpu_video_accelerator_factories.h
+++ b/content/renderer/media/renderer_gpu_video_accelerator_factories.h
@@ -13,6 +13,7 @@
 #include "base/synchronization/waitable_event.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/common/content_export.h"
+#include "content/common/gpu/client/gl_helper.h"
 #include "media/filters/gpu_video_accelerator_factories.h"
 #include "ui/gfx/size.h"
 
@@ -78,10 +79,12 @@ class CONTENT_EXPORT RendererGpuVideoAcceleratorFactories
   // Helper to get a pointer to the WebGraphicsContext3DCommandBufferImpl,
   // if it has not been lost yet.
   WebGraphicsContext3DCommandBufferImpl* GetContext3d();
+  GLHelper* GetGLHelper();
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_refptr<GpuChannelHost> gpu_channel_host_;
   scoped_refptr<ContextProviderCommandBuffer> context_provider_;
+  scoped_ptr<GLHelper> gl_helper_;
 
   // For sending requests to allocate shared memory in the Browser process.
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;