Revert of Revert "Post loading tasks on the appropriate WebFrameScheduler's queue."

third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp

Index: third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp b/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp
index 8cf1c0484cf020e54e02e18caf429155c9986b45..abc94b7fe45d54dacbf5343d12c961e929cb98d1 100644
--- a/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp
@@ -260,13 +260,19 @@
         MockWebTaskRunner() : m_task(0) { }
         ~MockWebTaskRunner() override { }
 
-        virtual void postTask(const WebTraceLocation&, Task* task)
+        void postTask(const WebTraceLocation&, Task* task) override
         {
             EXPECT_EQ((Task*)0, m_task);
             m_task = task;
         }
 
         void postDelayedTask(const WebTraceLocation&, Task*, double delayMs) override { ASSERT_NOT_REACHED(); };
+
+        WebTaskRunner* clone() override
+        {
+            ASSERT_NOT_REACHED();
+            return nullptr;
+        }
 
         Task* m_task;
     };