Patch 2/3 to get WebScheduler via WebThread

public/platform/WebScheduler.h

Index: public/platform/WebScheduler.h
diff --git a/public/platform/WebScheduler.h b/public/platform/WebScheduler.h
index 551327fc999ab6b2a3bc1b2838c9ab23d3e348dc..4ce434b30e4739ea72c228785efa57eeb56dd5db 100644
--- a/public/platform/WebScheduler.h
+++ b/public/platform/WebScheduler.h
@@ -57,6 +57,23 @@ public:
     // when the user is interacting with the device.
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
     virtual void postLoadingTask(const WebTraceLocation&, WebThread::Task*) { }
+
+    // Schedule a timer task to be run on the Blink main thread. Timer Tasks

[rmcilroy, 2015/04/16 12:53:00]

should we update the comments here to change 'Blink main thread' to be 'the
associated WebThread'? 

[alex clarke (OOO till 29th), 2015/04/16 13:41:36]

Done.

+    // tasks usually have the default priority, but may be delayed
+    // when the user is interacting with the device.
+    // Takes ownership of |WebThread::Task|. Can be called from any thread.
+    virtual void postTimerTask(const WebTraceLocation&, WebThread::Task*, long long delayMs) { }
+
+#ifdef INSIDE_BLINK
+    // Helpers for posting bound functions as tasks.
+    typedef Function<void(double deadlineSeconds)> IdleTask;
+    typedef Function<void()> Task;
+
+    void postIdleTask(const WebTraceLocation&, PassOwnPtr<IdleTask>);
+    void postNonNestableIdleTask(const WebTraceLocation&, PassOwnPtr<IdleTask>);
+    void postIdleTaskAfterWakeup(const WebTraceLocation&, PassOwnPtr<IdleTask>);
+    void postLoadingTask(const WebTraceLocation&, PassOwnPtr<Task>);
+#endif
 };
 
 } // namespace blink