gpu: Allow CopyTexImage to be called with StreamTextures and GLImageSync.

content/common/gpu/stream_texture_android.cc

 // Copyright (c) 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/common/gpu/stream_texture_android.h"
 
 #include "base/bind.h"
 #include "content/common/android/surface_texture_peer.h"
 #include "content/common/gpu/gpu_channel.h"
 #include "content/common/gpu/gpu_messages.h"
@@ skipping 185 matching lines @@
 bool StreamTexture::BindTexImage(unsigned target) {
   NOTREACHED();
   return false;
 }
 
 void StreamTexture::ReleaseTexImage(unsigned target) {
   NOTREACHED();
 }
 
 bool StreamTexture::CopyTexImage(unsigned target) {
-  NOTREACHED();
   return false;
 }
 
 bool StreamTexture::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                          int z_order,
                                          gfx::OverlayTransform transform,
                                          const gfx::Rect& bounds_rect,
                                          const gfx::RectF& crop_rect) {
   NOTREACHED();
   return false;
 }
 
 }  // namespace content