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diff --git a/Source/WebCore/plugins/IFrameShimSupport.cpp b/Source/WebCore/plugins/IFrameShimSupport.cpp
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+++ b/Source/WebCore/plugins/IFrameShimSupport.cpp
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+/*
+ * Copyright (C) 2011 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "IFrameShimSupport.h"
+
+#include "Element.h"
+#include "FrameView.h"
+#include "HTMLElement.h"
+#include "HTMLFrameOwnerElement.h"
+#include "HTMLNames.h"
+#include "RenderBox.h"
+#include "RenderObject.h"
+#include "Widget.h"
+
+#include <wtf/HashSet.h>
+
+// This file provides plugin-related utility functions for iframe shims and is shared by platforms that inherit
+// from PluginView (e.g. Qt) and those that do not (e.g. Chromium).
+
+namespace WebCore {
+
+static void getObjectStack(const RenderObject* ro, Vector<const RenderObject*>* roStack)
+{
+    roStack->clear();
+    while (ro) {
+        roStack->append(ro);
+        ro = ro->parent();
+    }
+}
+
+// Returns true if stack1 is at or above stack2
+static bool iframeIsAbovePlugin(const Vector<const RenderObject*>& iframeZstack, const Vector<const RenderObject*>& pluginZstack)
+{
+    for (size_t i = 0; i < iframeZstack.size() && i < pluginZstack.size(); i++) {
+        // The root is at the end of these stacks.  We want to iterate
+        // root-downwards so we index backwards from the end.
+        const RenderObject* ro1 = iframeZstack[iframeZstack.size() - 1 - i];
+        const RenderObject* ro2 = pluginZstack[pluginZstack.size() - 1 - i];
+
+        if (ro1 != ro2) {
+            // When we find nodes in the stack that are not the same, then
+            // we've found the nodes just below the lowest comment ancestor.
+            // Determine which should be on top.
+
+            // See if z-index determines an order.
+            if (ro1->style() && ro2->style()) {
+                int z1 = ro1->style()->zIndex();
+                int z2 = ro2->style()->zIndex();
+                if (z1 > z2)
+                    return true;
+                if (z1 < z2)
+                    return false;
+            }
+
+            // If the plugin does not have an explicit z-index it stacks behind the iframe.
+            // This is for maintaining compatibility with IE.
+            if (ro2->style()->position() == StaticPosition) {
+                // The 0'th elements of these RenderObject arrays represent the plugin node and
+                // the iframe.
+                const RenderObject* pluginRenderObject = pluginZstack[0];
+                const RenderObject* iframeRenderObject = iframeZstack[0];
+
+                if (pluginRenderObject->style() && iframeRenderObject->style()) {
+                    if (pluginRenderObject->style()->zIndex() > iframeRenderObject->style()->zIndex())
+                        return false;
+                }
+                return true;
+            }
+
+            // Inspect the document order.  Later order means higher stacking.
+            const RenderObject* parent = ro1->parent();
+            if (!parent)
+                return false;
+            ASSERT(parent == ro2->parent());
+
+            for (const RenderObject* ro = parent->firstChild(); ro; ro = ro->nextSibling()) {
+                if (ro == ro1)
+                    return false;
+                if (ro == ro2)
+                    return true;
+            }
+            ASSERT(false); // We should have seen ro1 and ro2 by now.
+            return false;
+        }
+    }
+    return true;
+}
+
+// Return a set of rectangles that should not be overdrawn by the
+// plugin ("cutouts").  This helps implement the "iframe shim"
+// technique of overlaying a windowed plugin with content from the
+// page.  In a nutshell, iframe elements should occlude plugins when
+// they occur higher in the stacking order.
+void getPluginOcclusions(Element* element, Widget* parentWidget, const IntRect& frameRect, Vector<IntRect>& occlusions)
+{
+    RenderObject* pluginNode = element->renderer();
+    ASSERT(pluginNode);
+    if (!pluginNode->style())
+        return;
+    Vector<const RenderObject*> pluginZstack;
+    Vector<const RenderObject*> iframeZstack;
+    getObjectStack(pluginNode, &pluginZstack);
+
+    if (!parentWidget->isFrameView())
+        return;
+
+    FrameView* parentFrameView = static_cast<FrameView*>(parentWidget);
+
+    const HashSet<RefPtr<Widget> >* children = parentFrameView->children();
+    for (HashSet<RefPtr<Widget> >::const_iterator it = children->begin(); it != children->end(); ++it) {
+        // We only care about FrameView's because iframes show up as FrameViews.
+        if (!(*it)->isFrameView())
+            continue;
+
+        const FrameView* frameView = static_cast<const FrameView*>((*it).get());
+        // Check to make sure we can get both the element and the RenderObject
+        // for this FrameView, if we can't just move on to the next object.
+        if (!frameView->frame() || !frameView->frame()->ownerElement()
+            || !frameView->frame()->ownerElement()->renderer())
+            continue;
+
+        HTMLElement* element = frameView->frame()->ownerElement();
+        RenderObject* iframeRenderer = element->renderer();
+
+        if (element->hasTagName(HTMLNames::iframeTag)
+            && iframeRenderer->absoluteBoundingBoxRect().intersects(frameRect)
+            && (!iframeRenderer->style() || iframeRenderer->style()->visibility() == VISIBLE)) {
+            getObjectStack(iframeRenderer, &iframeZstack);
+            if (iframeIsAbovePlugin(iframeZstack, pluginZstack)) {
+                IntPoint point = roundedIntPoint(iframeRenderer->localToAbsolute());
+                RenderBox* rbox = toRenderBox(iframeRenderer);
+                IntSize size(rbox->width(), rbox->height());
+                occlusions.append(IntRect(point, size));
+            }
+        }
+    }
+}
+
+} // namespace WebCore