Only add rescheduled message when there are commands to reschedule.

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index 15422eed569ed5c8e4c22400e7fd0d3b44ec5cb0..e240c52b3d3003a935281285cd39a8804428c0bf 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -129,6 +129,9 @@ class GpuCommandBufferStub
   // Whether this command buffer needs to be polled again in the future.
   bool HasMoreWork();
 
+  // Whether there are commands in the buffer that haven't been processed.
+  bool HasUnprocessedCommands();
+
   gpu::gles2::GLES2Decoder* decoder() const { return decoder_.get(); }
   gpu::GpuScheduler* scheduler() const { return scheduler_.get(); }