Adds a didReceiveInputEvent api to the blink scheduler

Source/platform/exported/WebSchedulerProxy.cpp

Index: Source/platform/exported/WebSchedulerProxy.cpp
diff --git a/Source/platform/exported/WebSchedulerProxy.cpp b/Source/platform/exported/WebSchedulerProxy.cpp
index 016abb0248d2e33a302623af6ab3312e2b3520cb..22388b1094554c7a4c2d57225cfe3c9656ef8f7d 100644
--- a/Source/platform/exported/WebSchedulerProxy.cpp
+++ b/Source/platform/exported/WebSchedulerProxy.cpp
@@ -49,4 +49,9 @@ void WebSchedulerProxy::postCompositorTask(const WebTraceLocation& webLocation,
     m_scheduler->postCompositorTask(location, bind(&runTask, adoptPtr(task)));
 }
 
+void WebSchedulerProxy::didReceiveInputEvent()
+{
+    m_scheduler->didReceiveInputEvent();
+}
+
 } // namespace blink