Blink: Pass 'unobscured' rect to WebPlugins.

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index acbd858b0686fc46ed2174cae7756cc06d1dec6b..760b99b9ed43b1b4de8ff18c3e56c28d935f7a2f 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -2202,6 +2202,30 @@ IntRect FrameView::windowClipRectForFrameOwner(const HTMLFrameOwnerElement* owne
     return intersection(clipRect, windowClipRect());
 }
 
+IntRect FrameView::unobscuredRectForFrameOwner(const HTMLFrameOwnerElement* ownerElement) const
+{
+    if (!ownerElement->layoutObject())
+        return IntRect();
+
+    const DeprecatedPaintLayer* enclosingLayer = ownerElement->layoutObject()->enclosingLayer();
+    if (!enclosingLayer)
+        return IntRect();
+
+    // FIXME: childrenClipRect relies on compositingState, which is not necessarily up to date.
+    // https://code.google.com/p/chromium/issues/detail?id=343769
+    DisableCompositingQueryAsserts disabler;
+
+    // Apply the clip from the layer.
+    IntRect clipRect = contentsToRootFrame(pixelSnappedIntRect(enclosingLayer->clipper().childrenClipRect()));
+
+    // If element is not in root frame, clip to the local frame.
+    // FIXME: Do we need to do this for remote frames?
+    if (m_frame->deprecatedLocalOwner())
+        clipRect.intersect(contentsToRootFrame(visibleContentRect()));
+
+    return clipRect;
+}
+
 bool FrameView::shouldUseIntegerScrollOffset() const
 {
     if (m_frame->settings() && !m_frame->settings()->preferCompositingToLCDTextEnabled())