Reuse GLFenceNV when an existing CommandsCompletedQuery is reused

gpu/command_buffer/service/query_manager.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.
 
 #include "gpu/command_buffer/service/query_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/atomicops.h"
@@ skipping 486 matching lines @@
 
 void CommandsCompletedQuery::Pause() {
   MarkAsPaused();
 }
 
 void CommandsCompletedQuery::Resume() {
   MarkAsActive();
 }
 
 bool CommandsCompletedQuery::End(base::subtle::Atomic32 submit_count) {
-  fence_.reset(gfx::GLFence::Create());
+  if (fence_ && fence_->ResetSupported()) {
+    fence_->ResetState();
+  }
+  else {
+    fence_.reset(gfx::GLFence::Create());
+  }
   DCHECK(fence_);
   return AddToPendingQueue(submit_count);
 }
 
 bool CommandsCompletedQuery::QueryCounter(base::subtle::Atomic32 submit_count) {
   NOTREACHED();
   return false;
 }
 
 bool CommandsCompletedQuery::Process(bool did_finish) {
@@ skipping 605 matching lines @@
   for (std::pair<const GLenum, scoped_refptr<Query> >& it : active_queries_) {
     if (it.second->IsPaused()) {
       it.second->Resume();
       DCHECK(it.second->IsActive());
     }
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu