Use fast path of mailbox generation in RGVAF::CreateTextures.

content/renderer/media/renderer_gpu_video_accelerator_factories.cc

 // Copyright 2013 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.
 
 #include "content/renderer/media/renderer_gpu_video_accelerator_factories.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "base/bind.h"
@@ skipping 205 matching lines @@
       gles2->TexImage2D(texture_target,
                         0,
                         GL_RGBA,
                         size.width(),
                         size.height(),
                         0,
                         GL_RGBA,
                         GL_UNSIGNED_BYTE,
                         NULL);
     }
-    gles2->GenMailboxCHROMIUM(created_texture_mailboxes_[i].name);
+    // GLES2Implementation doesn't currently have the fast path of mailbox
+    // generation, but WebGraphicsContext3DCommandBufferImpl does.
+    context_->genMailboxCHROMIUM(created_texture_mailboxes_[i].name);
     gles2->ProduceTextureCHROMIUM(texture_target,
                                   created_texture_mailboxes_[i].name);
   }
 
   // We need a glFlush here to guarantee the decoder (in the GPU process) can
   // use the texture ids we return here.  Since textures are expected to be
   // reused, this should not be unacceptably expensive.
   gles2->Flush();
   DCHECK_EQ(gles2->GetError(), static_cast<GLenum>(GL_NO_ERROR));
 
@@ skipping 182 matching lines @@
 }
 
 void
 RendererGpuVideoAcceleratorFactories::AsyncDestroyVideoEncodeAccelerator() {
   // OK to release because Destroy() will delete the VDA instance.
   if (vea_)
     vea_.release()->Destroy();
 }
 
 }  // namespace content