Provision to start base::SimpleTestTickClock at initial ticks

content/browser/media/audio_stream_monitor_unittest.cc

 // Copyright 2014 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 "content/browser/media/audio_stream_monitor.h"
 
 #include <map>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 24 matching lines @@
 class MockWebContentsDelegate : public WebContentsDelegate {
  public:
   MOCK_METHOD2(NavigationStateChanged,
                void(WebContents* source, InvalidateTypes changed_flags));
 };
 
 }  // namespace
 
 class AudioStreamMonitorTest : public RenderViewHostTestHarness {
  public:
-  AudioStreamMonitorTest() {
-    // Start |clock_| at non-zero.
-    clock_.Advance(base::TimeDelta::FromSeconds(1000000));
-  }
+  AudioStreamMonitorTest()
+      :  // Start |clock_| at non-zero.
+        clock_(base::TimeTicks() + base::TimeDelta::FromSeconds(1000000)) {}
 
   void SetUp() override {
     RenderViewHostTestHarness::SetUp();
 
     WebContentsImpl* web_contents = reinterpret_cast<WebContentsImpl*>(
         RenderViewHostTestHarness::web_contents());
     web_contents->SetDelegate(&mock_web_contents_delegate_);
 
     monitor_ = web_contents->audio_stream_monitor();
     const_cast<base::TickClock*&>(monitor_->clock_) = &clock_;
@@ skipping 231 matching lines @@
   StartMonitoring(
       kAnotherRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
   ExpectIsPolling(kRenderProcessId, kStreamId, true);
   ExpectIsPolling(kAnotherRenderProcessId, kStreamId, true);
   StopMonitoring(kAnotherRenderProcessId, kStreamId);
   ExpectIsPolling(kRenderProcessId, kStreamId, true);
   ExpectIsPolling(kAnotherRenderProcessId, kStreamId, false);
 }
 
 }  // namespace content