Reduce internal Flush() in GL resource glGen/Delete APIs.

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 "gpu/command_buffer/common/command_buffer.h"
@@ skipping 138 matching lines @@
     return false;
   }
 
   // Wrap put_ before flush.
   if (put_ == total_entry_count_)
     put_ = 0;
 
   last_flush_time_ = clock();
   last_put_sent_ = put_;
   CommandBuffer::State state = command_buffer_->FlushSync(put_, get_offset());
+  ++flush_generation_;
   CalcImmediateEntries(0);
   return state.error == error::kNoError;
 }
 
 void CommandBufferHelper::Flush() {
   // Wrap put_ before flush.
   if (put_ == total_entry_count_)
     put_ = 0;
 
   if (usable() && last_put_sent_ != put_) {
     last_flush_time_ = clock();
     last_put_sent_ = put_;
     command_buffer_->Flush(put_);
+    ++flush_generation_;
     CalcImmediateEntries(0);
   }
 }
 
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
 void CommandBufferHelper::PeriodicFlushCheck() {
   clock_t current_time = clock();
   if (current_time - last_flush_time_ > kPeriodicFlushDelay * CLOCKS_PER_SEC)
     Flush();
 }
@@ skipping 124 matching lines @@
         if (!FlushSync())
           return;
         CalcImmediateEntries(count);
       }
     }
   }
 }
 
 
 }  // namespace gpu