Add a workaround for copyTexImage2D as it is sometimes broken on OSX.

gpu/command_buffer/tests/gl_manager.h

Index: gpu/command_buffer/tests/gl_manager.h
diff --git a/gpu/command_buffer/tests/gl_manager.h b/gpu/command_buffer/tests/gl_manager.h
index 4ee1389c5c13cb0064aaf686470a2758abbe5892..1301fe4cae37e5de60026b4d515677c9fc0a1e21 100644
--- a/gpu/command_buffer/tests/gl_manager.h
+++ b/gpu/command_buffer/tests/gl_manager.h
@@ -78,7 +78,7 @@ class GLManager : private GpuControl {
   GLManager();
   ~GLManager() override;
 
-  static scoped_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBuffer(
+  scoped_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBuffer(
       const gfx::Size& size,
       gfx::BufferFormat format);
 
@@ -93,6 +93,10 @@ class GLManager : private GpuControl {
 
   void SetSurface(gfx::GLSurface* surface);
 
+  void set_use_iosurface_memory_buffers(bool use_iosurface_memory_buffers) {
+    use_iosurface_memory_buffers_ = use_iosurface_memory_buffers;
+  }
+
   void SetCommandsPaused(bool paused) { pause_commands_ = paused; }
 
   gles2::GLES2Decoder* decoder() const {
@@ -175,6 +179,8 @@ class GLManager : private GpuControl {
   const CommandBufferId command_buffer_id_;
   uint64_t next_fence_sync_release_;
 
+  bool use_iosurface_memory_buffers_ = false;
+
   // Used on Android to virtualize GL for all contexts.
   static int use_count_;
   static scoped_refptr<gfx::GLShareGroup>* base_share_group_;