Use a singleton 1x1 offscreen surface for all TextureImageTransportSurface instances.

content/common/gpu/gpu_channel_manager.cc

 // Copyright (c) 2012 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/gpu_channel_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "content/common/child_thread.h"
 #include "content/common/gpu/gpu_channel.h"
@@ skipping 20 matching lines @@
       watchdog_(watchdog),
       sync_point_manager_(new SyncPointManager),
       program_cache_(NULL) {
   DCHECK(gpu_child_thread);
   DCHECK(io_message_loop);
   DCHECK(shutdown_event);
 }
 
 GpuChannelManager::~GpuChannelManager() {
   gpu_channels_.clear();
+  if (default_offscreen_surface_.get()) {
+    default_offscreen_surface_->Destroy();
+    default_offscreen_surface_ = NULL;
+  }
 }
 
 gpu::gles2::ProgramCache* GpuChannelManager::program_cache() {
   if (!program_cache_.get() &&
       (gfx::g_ARB_get_program_binary || gfx::g_OES_get_program_binary) &&
       !CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableGpuProgramCache)) {
     program_cache_.reset(new gpu::gles2::MemoryProgramCache());
   }
   return program_cache_.get();
@@ skipping 117 matching lines @@
 void GpuChannelManager::LoseAllContexts() {
   MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&GpuChannelManager::OnLoseAllContexts,
                  weak_factory_.GetWeakPtr()));
 }
 
 void GpuChannelManager::OnLoseAllContexts() {
   gpu_channels_.clear();
 }
+
+gfx::GLSurface* GpuChannelManager::GetDefaultOffscreenSurface() {
+  if (!default_offscreen_surface_.get()) {
+    default_offscreen_surface_ = gfx::GLSurface::CreateOffscreenGLSurface(
+        false, gfx::Size(1, 1));
+  }
+  return default_offscreen_surface_.get();
+}