Add canUpdateLayout & canHandleGestureEvent to WebViewClient.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 677 matching lines @@
     syntheticGestureEvent.data.scrollUpdate.inertialPhase =
         WebGestureEvent::MomentumPhase;
 
     return handleGestureEvent(syntheticGestureEvent) !=
            WebInputEventResult::NotHandled;
   }
 }
 
 WebInputEventResult WebViewImpl::handleGestureEvent(
     const WebGestureEvent& event) {
-  if (!m_client)
+  if (!m_client || !m_client->canHandleGestureEvent()) {
     return WebInputEventResult::NotHandled;
+  }
 
   WebInputEventResult eventResult = WebInputEventResult::NotHandled;
   bool eventCancelled = false;  // for disambiguation
 
   // Special handling for slow-path fling gestures.
   switch (event.type()) {
     case WebInputEvent::GestureFlingStart: {
       if (mainFrameImpl()
               ->frame()
               ->eventHandler()
@@ skipping 2930 matching lines @@
 void WebViewImpl::postLayoutResize(WebLocalFrameImpl* webframe) {
   FrameView* view = webframe->frame()->view();
   if (webframe == mainFrame())
     m_resizeViewportAnchor->resizeFrameView(mainFrameSize());
   else
     view->resize(webframe->frameView()->size());
 }
 
 void WebViewImpl::layoutUpdated(WebLocalFrameImpl* webframe) {
   LocalFrame* frame = webframe->frame();
-  if (!m_client || !frame->isMainFrame())
+  if (!m_client || !m_client->canUpdateLayout() || !frame->isMainFrame())
     return;
 
   if (m_shouldAutoResize) {
     WebSize frameSize = frame->view()->frameRect().size();
     if (frameSize != m_size) {
       m_size = frameSize;
 
       page()->visualViewport().setSize(m_size);
       pageScaleConstraintsSet().didChangeInitialContainingBlockSize(m_size);
       frame->view()->setInitialViewportSize(m_size);
@@ skipping 516 matching lines @@
   if (focusedFrame->localFrameRoot() != mainFrameImpl()->frame())
     return nullptr;
   return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const {
   return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink