[Reland] Per WebViewScheduler virtual time

third_party/WebKit/Source/platform/testing/UnitTestHelpers.cpp

 /*
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 36 matching lines @@
         exitRunLoop();
     }
 };
 
 void runPendingTasks()
 {
     Platform::current()->currentThread()->taskRunner()->postTask(BLINK_FROM_HERE, new QuitTask);
     enterRunLoop();
 }
 
+void runTasksForPeriodInMilliseconds(double runTimeMilliseconds)
+{
+    Platform::current()->currentThread()->taskRunner()->postDelayedTask(BLINK_FROM_HERE, new QuitTask, runTimeMilliseconds);

[esprehn, 2016/02/23 10:30:11]

This is scary, what keeps this from being flaky?

[alex clarke (OOO till 29th), 2016/02/23 17:16:57]

Turns out we don't actually need this for
VirtualTimeTest.DOMTimersFireInExpectedOrder.

The other test which used this api (the non-virtual time case) isn't strictly
needed since there's a lot of test coverage elsewhere, so I've dropped it along
with runTasksForPeriodInMilliseconds.

+    enterRunLoop();
+}
+
 String blinkRootDir()
 {
     base::FilePath path;
     base::PathService::Get(base::DIR_SOURCE_ROOT, &path);
     path = path.Append(FILE_PATH_LITERAL("third_party/WebKit"));
     path = base::MakeAbsoluteFilePath(path);
     return String::fromUTF8(path.MaybeAsASCII().c_str());
 }
 
 PassRefPtr<SharedBuffer> readFromFile(const String& path)
@@ skipping 16 matching lines @@
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
 void yieldCurrentThread()
 {
     base::PlatformThread::YieldCurrentThread();
 }
 
 } // namespace testing
 } // namespace blink