Refactor TimeBase to post tasks. Workers to use real Idle tasks.

Source/core/dom/ScriptRunnerTest.cpp

 // Copyright 2015 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 "config.h"
 #include "core/dom/ScriptRunner.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/ScriptLoader.h"
@@ skipping 70 matching lines @@
 private:
     Deque<OwnPtr<WebThread::Task>> m_tasks;
     bool m_shouldYield;
     bool m_shouldYieldEveryOtherTime;
 };
 
 class ScriptRunnerTest : public testing::Test {
 public:
     void SetUp() override
     {
+        Scheduler::shutdown();
+
+        m_oldPlatform = Platform::current();
+        Platform::initialize(&m_platform);
         m_document = Document::create();
         m_element = m_document->createElement("foo", ASSERT_NO_EXCEPTION);
 
         m_scriptRunner = ScriptRunner::create(m_document.get());
         m_oldPlatform = Platform::current();
         m_oldScheduler = Scheduler::shared();
 
         // Force Platform::initialize to create a new one pointing at MockPlatform.
         Scheduler::setForTesting(nullptr);
         Platform::initialize(&m_platform);
@@ skipping 409 matching lines @@
     testing::Mock::VerifyAndClear(&scriptLoader2);
     testing::Mock::VerifyAndClear(&scriptLoader3);
     EXPECT_CALL(scriptLoader2, execute()).Times(1);
     EXPECT_CALL(scriptLoader3, execute()).Times(1);
     EXPECT_CALL(scriptLoader2, isReady()).WillRepeatedly(Return(true));
     EXPECT_CALL(scriptLoader3, isReady()).WillRepeatedly(Return(true));
     m_platform.runAllTasks();
 }
 
 } // namespace blink