Add OrderingBarrierCHROMIUM API.

content/common/gpu/client/command_buffer_proxy_impl.cc

Index: content/common/gpu/client/command_buffer_proxy_impl.cc
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.cc b/content/common/gpu/client/command_buffer_proxy_impl.cc
index ec473f3295f74957a3d246df20e1deb84d09908e..03766181c677c08733674534e934f285a0224398 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.cc
+++ b/content/common/gpu/client/command_buffer_proxy_impl.cc
@@ -25,13 +25,13 @@
 
 namespace content {
 
-CommandBufferProxyImpl::CommandBufferProxyImpl(
-    GpuChannelHost* channel,
-    int route_id)
+CommandBufferProxyImpl::CommandBufferProxyImpl(GpuChannelHost* channel,
+                                               int route_id)
     : channel_(channel),
       route_id_(route_id),
       flush_count_(0),
       last_put_offset_(-1),
+      last_shallow_put_offset_(-1),
       next_signal_id_(0) {
 }
 
@@ -183,11 +183,30 @@ void CommandBufferProxyImpl::Flush(int32 put_offset) {
     return;
 
   last_put_offset_ = put_offset;
+  last_shallow_put_offset_ = put_offset;
+
+  if (channel_)
+    channel_->Flush(route_id_, put_offset, ++flush_count_, latency_info_,
+                    false);
+
+  latency_info_.clear();
+}
+
+void CommandBufferProxyImpl::ShallowFlush(int32 put_offset) {
+  if (last_state_.error != gpu::error::kNoError)
+    return;
+
+  TRACE_EVENT1("gpu", "CommandBufferProxyImpl::ShallowFlush", "put_offset",
+               put_offset);
+
+  if (last_shallow_put_offset_ == put_offset)
+    return;
+
+  last_shallow_put_offset_ = put_offset;
+
+  if (channel_)
+    channel_->Flush(route_id_, put_offset, ++flush_count_, latency_info_, true);
 
-  Send(new GpuCommandBufferMsg_AsyncFlush(route_id_,
-                                          put_offset,
-                                          ++flush_count_,
-                                          latency_info_));
   latency_info_.clear();
 }