Adjust windowRect of plugins for root frame scrolling.

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 956 matching lines @@
         rootView = rootView->frame()->ownerLayoutObject()->view();
 
     LayoutBox* box = toLayoutBox(ownerElement->layoutObject());
 
     // Plugin frameRects are in absolute screen space.
     IntRect frameRectInOwnerElementSpace = box->absoluteToLocalQuad(FloatRect(frameRect()), UseTransforms).enclosingBoundingBox();
 
     LayoutRect unclippedAbsoluteRect(frameRectInOwnerElementSpace);
     box->mapRectToPaintInvalidationBacking(rootView, unclippedAbsoluteRect, nullptr);
 
-    // The frameRect is already in absolute space.
+    // The frameRect is already in absolute space, except for scrolling of the root frame.
     windowRect = frameRect();
+    windowRect.moveBy(roundedIntPoint(-rootView->viewRect().location()));
 
     clippedLocalRect = enclosingIntRect(unclippedAbsoluteRect);
     unclippedIntLocalRect = clippedLocalRect;
     clippedLocalRect.intersect(rootView->frameView()->visibleContentRect());
 
     // TODO(chrishtr): intentionally ignore transform, because the positioning of frameRect() does also. This is probably wrong.
     unclippedIntLocalRect = box->absoluteToLocalQuad(FloatRect(unclippedIntLocalRect)).enclosingBoundingBox();
     clippedLocalRect = box->absoluteToLocalQuad(FloatRect(clippedLocalRect)).enclosingBoundingBox();
 }
 
 void WebPluginContainerImpl::calculateGeometry(IntRect& windowRect, IntRect& clipRect, IntRect& unobscuredRect, Vector<IntRect>& cutOutRects)
 {
-    // document().layoutView() can be 0 when we receive messages from the
+    // document().layoutView() can be null when we receive messages from the
     // plugins while we are destroying a frame.
     // FIXME: Can we just check m_element->document().isActive() ?
     if (m_element->layoutObject()->document().layoutView()) {
         // Take our element and get the clip rect from the enclosing layer and
         // 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