Add OrderingBarrierCHROMIUM API.

gpu/command_buffer/client/cmd_buffer_helper.cc

 // 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.
 
 // This file contains the implementation of the command buffer helper class.
 
 #include "gpu/command_buffer/client/cmd_buffer_helper.h"
 
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/trace_event.h"
 
 namespace gpu {
 
 CommandBufferHelper::CommandBufferHelper(CommandBuffer* command_buffer)
     : command_buffer_(command_buffer),
       ring_buffer_id_(-1),
       ring_buffer_size_(0),
       entries_(NULL),
       total_entry_count_(0),
       immediate_entry_count_(0),
       token_(0),
       put_(0),
       last_put_sent_(0),
+      last_shallow_put_sent_(0),
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
       commands_issued_(0),
 #endif
       usable_(true),
       context_lost_(false),
       flush_automatically_(true),
       flush_generation_(0) {
 }
 
 void CommandBufferHelper::SetAutomaticFlushes(bool enabled) {
@@ skipping 110 matching lines @@
 }
 
 void CommandBufferHelper::Flush() {
   // Wrap put_ before flush.
   if (put_ == total_entry_count_)
     put_ = 0;
 
   if (usable() && last_put_sent_ != put_) {
     last_flush_time_ = base::TimeTicks::Now();
     last_put_sent_ = put_;
+    last_shallow_put_sent_ = put_;
     command_buffer_->Flush(put_);
     ++flush_generation_;
     CalcImmediateEntries(0);
   }
 }
 
+void CommandBufferHelper::ShallowFlush() {
+  // Wrap put_ before flush.
+  if (put_ == total_entry_count_)
+    put_ = 0;
+
+  if (usable() && last_shallow_put_sent_ != put_) {
+    last_shallow_put_sent_ = put_;
+    command_buffer_->ShallowFlush(put_);
+    ++flush_generation_;
+    CalcImmediateEntries(0);
+  }
+}
+
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
 void CommandBufferHelper::PeriodicFlushCheck() {
   base::TimeTicks current_time = base::TimeTicks::Now();
   if (current_time - last_flush_time_ >
       base::TimeDelta::FromMicroseconds(kPeriodicFlushDelayInMicroseconds)) {
     Flush();
   }
 }
 #endif
 
@@ skipping 112 matching lines @@
       if (!WaitForGetOffsetInRange(put_ + count + 1, put_))
         return;
       CalcImmediateEntries(count);
       DCHECK_GE(immediate_entry_count_, count);
     }
   }
 }
 
 
 }  // namespace gpu