GLInProcessContext: support async flushes and dedicated GPU thread

webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

Index: webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
diff --git a/webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc b/webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
index 7f5f17018e175b0957de553413a1b485c105c6bb..0647f59802df75438b9c852ec680b0becfee359e 100644
--- a/webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
+++ b/webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
@@ -1163,11 +1163,6 @@ void WebGraphicsContext3DInProcessCommandBufferImpl::signalSyncPoint(
   // Take ownership of the callback.
   context_->SignalSyncPoint(
       sync_point, base::Bind(&OnSignalSyncPoint, base::Owned(callback)));
-  // Make sure we have something to flush, or shallowFlushCHROMIUM()
-  // doesn't do anything.
-  gl_->helper()->Noop(1);
-  // This fill force PumpCommands() to run which is what triggers the signal.
-  shallowFlushCHROMIUM();
 }
 
 void WebGraphicsContext3DInProcessCommandBufferImpl::signalQuery(