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

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),
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
       commands_issued_(0),
 #endif
       usable_(true),
       context_lost_(false),
       flush_automatically_(true),
-      last_flush_time_(0),
       flush_generation_(0) {
 }
 
 void CommandBufferHelper::SetAutomaticFlushes(bool enabled) {
   flush_automatically_ = enabled;
   CalcImmediateEntries(0);
 }
 
 bool CommandBufferHelper::IsContextLost() {
   if (!context_lost_) {
@@ skipping 102 matching lines @@
   command_buffer_->WaitForGetOffsetInRange(start, end);
   return command_buffer_->GetLastError() == gpu::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_flush_time_ = base::TimeTicks::Now();
     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)
+  base::TimeTicks current_time = base::TimeTicks::Now();
+  if (current_time - last_flush_time_ >
+      base::TimeDelta::FromMicroseconds(kPeriodicFlushDelayInMicroseconds)) {
     Flush();
+  }
 }
 #endif
 
 // Calls Flush() and then waits until the buffer is empty. Break early if the
 // error is set.
 bool CommandBufferHelper::Finish() {
   TRACE_EVENT0("gpu", "CommandBufferHelper::Finish");
   if (!usable()) {
     return false;
   }
@@ skipping 105 matching lines @@
       if (!WaitForGetOffsetInRange(put_ + count + 1, put_))
         return;
       CalcImmediateEntries(count);
       DCHECK_GE(immediate_entry_count_, count);
     }
   }
 }
 
 
 }  // namespace gpu