Revert "Remove kLogPluginMessages flag as part of flag cleanup."

content/common/gpu/gpu_channel.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 200 matching lines @@
   // The share group that all contexts associated with a particular renderer
   // process use.
   scoped_refptr<gfx::GLShareGroup> share_group_;
 
   scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
   scoped_refptr<gpu::gles2::ImageManager> image_manager_;
 
   typedef IDMap<GpuCommandBufferStub, IDMapOwnPointer> StubMap;
   StubMap stubs_;
 
+  bool log_messages_;  // True if we should log sent and received messages.
   gpu::gles2::DisallowedFeatures disallowed_features_;
   GpuWatchdog* watchdog_;
   bool software_;
   bool handle_messages_scheduled_;
   IPC::Message* currently_processing_message_;
 
   base::WeakPtrFactory<GpuChannel> weak_factory_;
 
   scoped_refptr<GpuChannelMessageFilter> filter_;
   scoped_refptr<base::MessageLoopProxy> io_message_loop_;
   scoped_ptr<DevToolsGpuAgent> devtools_gpu_agent_;
 
   size_t num_stubs_descheduled_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannel);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_H_