Allow expensive task blocking if there is pending iframe navigation

third_party/WebKit/Source/platform/TimerTest.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 "platform/Timer.h"
 
 #include "platform/testing/TestingPlatformSupport.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebThread.h"
@@ skipping 171 matching lines @@
     double nextTimerTaskDelaySecs() const
     {
         ASSERT(hasOneTimerTask());
         return m_timerTasks.top().delaySeconds();
     }
 
     void shutdown() override {}
     std::unique_ptr<WebViewScheduler> createWebViewScheduler(blink::WebView*) override { return nullptr; }
     void suspendTimerQueue() override { }
     void resumeTimerQueue() override { }
-    void addPendingNavigation() override { }
-    void removePendingNavigation() override { }
+    void addPendingNavigation(WebScheduler::NavigatingFrameType) override { }
+    void removePendingNavigation(WebScheduler::NavigatingFrameType) override { }
     void onNavigationStarted() override { }
 
 private:
     std::priority_queue<DelayedTask> m_timerTasks;
     MockWebTaskRunner m_timerWebTaskRunner;
 };
 
 class FakeWebThread : public WebThread {
 public:
     FakeWebThread() : m_webScheduler(adoptPtr(new MockWebScheduler())) { }
@@ skipping 557 matching lines @@
     TimerForTest<TimerTest> timer(this, &TimerTest::countingTask, &taskRunner);
     timer.startOneShot(0, BLINK_FROM_HERE);
 
     // Make sure the task was posted on taskRunner.
     EXPECT_FALSE(timerTasks.empty());
 }
 
 
 } // namespace
 } // namespace blink