Fix TestingPlatformSupportWithMockScheduler::runForPeriodSeconds

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 153 matching lines @@
 
   // Runs all currently queued immediate tasks and delayed tasks whose delay has
   // expired plus any immediate tasks that are posted as a result of running
   // those tasks.
   //
   // This function ignores future delayed tasks when deciding if the system is
   // idle.  If you need to ensure delayed tasks run, try runForPeriodSeconds()
   // instead.
   void runUntilIdle();
 
-  // Runs for |seconds|. Note we use a testing clock rather than the wall clock
-  // here.
+  // Runs for |seconds| the testing clock is advanced by |seconds|.  Note real
+  // time elapsed will typically much less than |seconds| because delays between
+  // timers are fast forwarded.
   void runForPeriodSeconds(double seconds);
 
   // Advances |m_clock| by |seconds|.
   void advanceClockSeconds(double seconds);
 
   scheduler::RendererScheduler* rendererScheduler() const;
 
   // Controls the behavior of |m_mockTaskRunner| if true, then |m_clock| will
   // be advanced to the next timer when there's no more immediate work to do.
   void setAutoAdvanceNowToPendingTasks(bool);
@@ skipping 20 matching lines @@
       m_discardableMemoryAllocator;
   std::unique_ptr<DummyPlatform> m_platform;
   std::unique_ptr<cc_blink::WebCompositorSupportImpl> m_compositorSupport;
   TestingPlatformSupport::Config m_testingPlatformConfig;
   std::unique_ptr<TestingPlatformSupport> m_testingPlatformSupport;
 };
 
 }  // namespace blink
 
 #endif  // TestingPlatformSupport_h