Simplify computation of the invalidation rect for a frame.

third_party/WebKit/Source/web/WebPluginContainerImpl.h

 /*
  * 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 147 matching lines @@
 
     DECLARE_VIRTUAL_TRACE();
     void dispose() override;
 
 #if ENABLE(OILPAN)
     LocalFrame* pluginFrame() const override { return frame(); }
     void shouldDisposePlugin() override;
 #endif
 
 private:
+    // Sets |windowRect| to the content rect of the plugin in screen space.
+    // Sets |clippedAbsoluteRect| to the visible rect for the plugin, clipped to the visible screen of the root frame, in local space of the plugin.
+    // Sets |unclippedAbsoluteRect| to the visible rect for the plugin (but without also clipping to the screen), in local space of the plugin.
+    void computeClipRectsForPlugin(
+        const HTMLFrameOwnerElement* pluginOwnerElement, IntRect& windowRect, IntRect& clippedLocalRect, IntRect& unclippedIntLocalRect) const;
+
     WebPluginContainerImpl(HTMLPlugInElement*, WebPlugin*);
     ~WebPluginContainerImpl() override;
 
     void handleMouseEvent(MouseEvent*);
     void handleDragEvent(MouseEvent*);
     void handleWheelEvent(WheelEvent*);
     void handleKeyboardEvent(KeyboardEvent*);
     void handleTouchEvent(TouchEvent*);
     void handleGestureEvent(GestureEvent*);
 
@@ skipping 32 matching lines @@
 };
 
 DEFINE_TYPE_CASTS(WebPluginContainerImpl, Widget, widget, widget->isPluginContainer(), widget.isPluginContainer());
 // Unlike Widget, we need not worry about object type for container.
 // WebPluginContainerImpl is the only subclass of WebPluginContainer.
 DEFINE_TYPE_CASTS(WebPluginContainerImpl, WebPluginContainer, container, true, true);
 
 } // namespace blink
 
 #endif