(not for commit) Simplified multi-threaded Ganesh with lock on Flush only.

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index be28c50c73e3ac2de6b926a4195b1f0c0ebc5715..8701a9a4558763fb0a9e9c1f6872772a0b22b094 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -102,13 +102,18 @@ bool GpuChannelHost::Send(IPC::Message* msg) {
     if (!result)
       DVLOG(1) << "GpuChannelHost::Send failed: Channel::Send failed";
     return result;
-  } else if (base::MessageLoop::current()) {
+
+    // TODO(vmiura): Nasty hack, could be hazardous to health!
+    //} else if (base::MessageLoop::current()) {
+  } else {
     bool result = sync_filter_->Send(message.release());
     if (!result)
       DVLOG(1) << "GpuChannelHost::Send failed: SyncMessageFilter::Send failed";
     return result;
   }
 
+  LOG(ERROR) << "... GpuChannelHost::Send() failed!!!";
+
   return false;
 }