Mac: Don't hang gpu process on popup close under certain conditions

chrome/gpu/gpu_command_buffer_stub.h

Index: chrome/gpu/gpu_command_buffer_stub.h
diff --git a/chrome/gpu/gpu_command_buffer_stub.h b/chrome/gpu/gpu_command_buffer_stub.h
index e61bdd072129ba8d7f87efbfa4a2e45ebba6a46b..66d175997b9ef9075e6bb2ea13b455db9e353930 100644
--- a/chrome/gpu/gpu_command_buffer_stub.h
+++ b/chrome/gpu/gpu_command_buffer_stub.h
@@ -49,8 +49,13 @@ class GpuCommandBufferStub
   // Get the GLContext associated with this object.
   gpu::GPUProcessor* processor() const { return processor_.get(); }
 
+  // Identifies the various GpuCommandBufferStubs in the GPU process belonging
+  // to the same renderer process.
   int32 route_id() const { return route_id_; }
 
+  // Identifies the various render views in the renderer process.
+  int32 renderer_route_id() const { return renderer_id_; }
+
 #if defined(OS_WIN)
   // Called only by the compositor window's window proc
   void OnCompositorWindowPainted();