Connect GpuVideoDecodeServiceHost with ggl::Context and CommandBufferProxy

chrome/renderer/ggl/ggl.h

Index: chrome/renderer/ggl/ggl.h
diff --git a/chrome/renderer/ggl/ggl.h b/chrome/renderer/ggl/ggl.h
index 38f83adf92f59fc19532ce3218d05a2fc1ad12a8..8d3f0e2acbe1ed2b50bc8f4276880eeb813a98a6 100644
--- a/chrome/renderer/ggl/ggl.h
+++ b/chrome/renderer/ggl/ggl.h
@@ -16,6 +16,7 @@
 #include "gfx/size.h"
 
 class GpuChannelHost;
+class GpuVideoDecoderHost;
 
 namespace ggl {
 
@@ -114,6 +115,9 @@ bool SwapBuffers(Context* context);
 // Destroy the given GGL context.
 bool DestroyContext(Context* context);
 
+// Create a hardware video decoder corresponding to the context.
+GpuVideoDecoderHost* CreateVideoDecoder(Context* context);
+
 // TODO(gman): Remove this
 void DisableShaderTranslation(Context* context);