content: Add command line flag for native GPU memory buffers.

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/synchronization/lock.h"
@@ skipping 5659 matching lines @@
   void InitializeSettings(LayerTreeSettings* settings) override {
     settings->use_one_copy = true;
   }
 
   scoped_ptr<FakeOutputSurface> CreateFakeOutputSurface(
       bool fallback) override {
     scoped_ptr<TestWebGraphicsContext3D> context3d =
         TestWebGraphicsContext3D::Create();
     context3d->set_support_image(true);
     context3d->set_support_sync_query(true);
+#if defined(OS_MACOSX)
+    context3d->set_support_texture_rectangle(true);
+#endif
 
     if (delegating_renderer())
       return FakeOutputSurface::CreateDelegating3d(context3d.Pass());
     else
       return FakeOutputSurface::Create3d(context3d.Pass());
   }
 };
 
 MULTI_THREAD_IMPL_TEST_F(LayerTreeHostTestCrispUpAfterPinchEndsWithOneCopy);
 
@@ skipping 168 matching lines @@
 
   FakeContentLayerClient client_;
   int step_;
   int continuous_draws_;
   base::WaitableEvent playback_allowed_event_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostTestContinuousDrawWhenCreatingVisibleTiles);
 
 }  // namespace cc