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

Index: content/common/gpu/gpu_channel_manager.cc
diff --git a/content/common/gpu/gpu_channel_manager.cc b/content/common/gpu/gpu_channel_manager.cc
index 7bbfea1de7d38ed0cdf50d55ef01dfd37829edbc..3e056e5e7cb7b5fc436dba37c509e2207fe1cc34 100644
--- a/content/common/gpu/gpu_channel_manager.cc
+++ b/content/common/gpu/gpu_channel_manager.cc
@@ -297,7 +297,7 @@ void GpuChannelManager::OnLoseAllContexts() {
 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();
 }