Updating calls to offscreen buffers to use a size of (0,0) when they do not require an actual buffer

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/gpu/gpu_channel.h"
 #include "content/common/gpu/gpu_memory_manager.h"
@@ skipping 279 matching lines @@
                  weak_factory_.GetWeakPtr()));
 }
 
 void GpuChannelManager::OnLoseAllContexts() {
   gpu_channels_.clear();
 }
 
 gfx::GLSurface* GpuChannelManager::GetDefaultOffscreenSurface() {
   if (!default_offscreen_surface_.get()) {
     default_offscreen_surface_ =
-        gfx::GLSurface::CreateOffscreenGLSurface(gfx::Size(1, 1));
+        gfx::GLSurface::CreateOffscreenGLSurface(gfx::Size());

[Ken Russell (switch to Gerrit), 2014/05/27 18:46:59]

Does this change work correctly on Mac OS? It looks like the tests passed, but I
thought that Mac OS would also refuse to allocate zero-sized pbuffers -- perhaps
only on older versions of the operating system.

   }
   return default_offscreen_surface_.get();
 }
 
 }  // namespace content