Move compositor InputHandler from RenderViewImpl to RenderWidget.

third_party/WebKit/Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 1324 matching lines @@
   if (m_frame->document()) {
     RefPtr<SecurityOrigin> securityOrigin =
         SecurityOrigin::create(m_provisionalDocumentLoader->getRequest().url());
     m_provisionalDocumentLoader->timing().setHasSameOriginAsPreviousDocument(
         securityOrigin->canRequest(m_frame->document()->url()));
   }
 
   if (!prepareForCommit())
     return;
 
-  if (isLoadingMainFrame()) {
+  // If we are loading the mainframe, or a frame that is a local root, it is
+  // important to explicitly set the event listenener properties to Nothing as
+  // this triggers notificatins to the client.

[dcheng, 2017/01/18 00:13:03]

Nit: elaborate on what sort of notifications to the client, and why they're
important to send.

[wjmaclean, 2017/01/18 14:01:23]

Done.

+  if (m_frame->isLocalRoot()) {
     m_frame->page()->chromeClient().setEventListenerProperties(
-        WebEventListenerClass::TouchStartOrMove,
+        m_frame, WebEventListenerClass::TouchStartOrMove,
         WebEventListenerProperties::Nothing);
     m_frame->page()->chromeClient().setEventListenerProperties(
-        WebEventListenerClass::MouseWheel, WebEventListenerProperties::Nothing);
+        m_frame, WebEventListenerClass::MouseWheel,
+        WebEventListenerProperties::Nothing);
     m_frame->page()->chromeClient().setEventListenerProperties(
-        WebEventListenerClass::TouchEndOrCancel,
+        m_frame, WebEventListenerClass::TouchEndOrCancel,
         WebEventListenerProperties::Nothing);
   }
 
   client()->transitionToCommittedForNewPage();
   m_frame->navigationScheduler().cancel();
   m_frame->editor().clearLastEditCommand();
 
   // If we are still in the process of initializing an empty document then its
   // frame is not in a consistent state for rendering, so avoid
   // setJSStatusBarText since it may cause clients to attempt to render the
@@ skipping 542 matching lines @@
                          m_documentLoader ? m_documentLoader->url() : String());
   return tracedValue;
 }
 
 inline void FrameLoader::takeObjectSnapshot() const {
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("loading", "FrameLoader", this,
                                       toTracedValue());
 }
 
 }  // namespace blink