Reduce the number of flushes while using glQueries.

gpu/command_buffer/client/query_tracker.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_QUERY_TRACKER_H_
 #define GPU_COMMAND_BUFFER_CLIENT_QUERY_TRACKER_H_
 
 #include <GLES2/gl2.h>
 
 #include <deque>
@@ skipping 95 matching lines @@
     void MarkAsActive() {
       state_ = kActive;
       ++submit_count_;
       if (submit_count_ == INT_MAX)
         submit_count_ = 1;
     }
 
     void MarkAsPending(int32 token) {
       token_ = token;
       state_ = kPending;
-      flushed_ = false;
     }
 
     base::subtle::Atomic32 submit_count() const { return submit_count_; }
 
     int32 token() const {
       return token_;
     }
 
     bool NeverUsed() const {
       return state_ == kUninitialized;
@@ skipping 13 matching lines @@
    private:
     friend class QueryTracker;
     friend class QueryTrackerTest;
 
     GLuint id_;
     GLenum target_;
     QuerySyncManager::QueryInfo info_;
     State state_;
     base::subtle::Atomic32 submit_count_;
     int32 token_;
-    bool flushed_;
+    uint32 flush_count_;
     uint64 client_begin_time_us_; // Only used for latency query target.
     uint32 result_;
   };
 
   QueryTracker(MappedMemoryManager* manager);
   ~QueryTracker();
 
   Query* CreateQuery(GLuint id, GLenum target);
   Query* GetQuery(GLuint id);
   void RemoveQuery(GLuint id);
   void Shrink();
   void FreeCompletedQueries();
 
  private:
   typedef base::hash_map<GLuint, Query*> QueryMap;
   typedef std::list<Query*> QueryList;
 
   QueryMap queries_;
   QueryList removed_queries_;
   QuerySyncManager query_sync_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(QueryTracker);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_QUERY_TRACKER_H_