Don't call LayoutPart::widgetPositionsUpdated unnecessarily.

third_party/WebKit/Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. 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.
@@ skipping 87 matching lines @@
 #include "web/WebViewImpl.h"
 #include "wtf/Assertions.h"
 
 namespace blink {
 
 // Public methods --------------------------------------------------------------
 
 void WebPluginContainerImpl::setFrameRect(const IntRect& frameRect)
 {
     Widget::setFrameRect(frameRect);
-    reportGeometry();

[wkorman, 2015/12/14 23:22:10]

So this was just spurious over-reporting, and reportGeometry() always still ends
up being called through eventual calls into
WebPluginContainerImpl::widgetGeometryMayHaveChanged() instead?

 }
 
 void WebPluginContainerImpl::layoutIfNeeded()
 {
     RELEASE_ASSERT(m_webPlugin);
     m_webPlugin->layoutIfNeeded();
 }
 
 void WebPluginContainerImpl::paint(GraphicsContext& context, const CullRect& cullRect) const
 {
@@ skipping 95 matching lines @@
     if (!event->defaultHandled())
         m_element->Node::defaultEventHandler(event);
 }
 
 void WebPluginContainerImpl::frameRectsChanged()
 {
     Widget::frameRectsChanged();
     reportGeometry();
 }
 
-void WebPluginContainerImpl::widgetPositionsUpdated()
+void WebPluginContainerImpl::widgetGeometryMayHaveChanged()
 {
-    Widget::widgetPositionsUpdated();
+    Widget::widgetGeometryMayHaveChanged();
     reportGeometry();
 }
 
 void WebPluginContainerImpl::eventListenersRemoved()
 {
     // We're no longer registered to receive touch events, so don't try to remove
     // the touch event handlers in our destructor.
     m_touchEventRequestType = TouchEventRequestTypeNone;
 }
 
@@ skipping 740 matching lines @@
         // frame view.
         computeClipRectsForPlugin(m_element, windowRect, clipRect, unobscuredRect);
     }
     getPluginOcclusions(m_element, this->parent(), frameRect(), cutOutRects);
     // Convert to the plugin position.
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 } // namespace blinkf