Use TimeTicks instead of clock() in gpu::CommandBufferHelper

gpu/command_buffer/client/cmd_buffer_helper.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.
 
 // This file contains the command buffer helper class.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_
 #define GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_
 
 #include <string.h>
 #include <time.h>
 
+#include "base/time/time.h"
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 
 #if !defined(OS_ANDROID)
 #define CMD_HELPER_PERIODIC_FLUSH_CHECK
 const int kCommandsPerFlushCheck = 100;
-const float kPeriodicFlushDelay = 1.0f / (5.0f * 60.0f);
+const int kPeriodicFlushDelayInMicroseconds =
+    base::Time::kMicrosecondsPerSecond / (5 * 60);
 #endif
 
 const int kAutoFlushSmall = 16;  // 1/16 of the buffer
 const int kAutoFlushBig = 2;     // 1/2 of the buffer
 
 // Command buffer helper class. This class simplifies ring buffer management:
 // it will allocate the buffer, give it to the buffer interface, and let the
 // user add commands to it, while taking care of the synchronization (put and
 // get). It also provides a way to ensure commands have been executed, through
 // the token mechanism:
@@ skipping 284 matching lines @@
   int32 last_put_sent_;
 
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
   int commands_issued_;
 #endif
 
   bool usable_;
   bool context_lost_;
   bool flush_automatically_;
 
-  // Using C runtime instead of base because this file cannot depend on base.
-  clock_t last_flush_time_;
+  base::TimeTicks last_flush_time_;
 
   // Incremented every time the helper flushes the command buffer.
   // Can be used to track when prior commands have been flushed.
   uint32 flush_generation_;
 
   friend class CommandBufferHelperTest;
   DISALLOW_COPY_AND_ASSIGN(CommandBufferHelper);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_CMD_BUFFER_HELPER_H_