Update parent layout when child frame requests innerHeight/innerWidth.

Source/core/html/HTMLFrameElementBase.cpp

Index: Source/core/html/HTMLFrameElementBase.cpp
diff --git a/Source/core/html/HTMLFrameElementBase.cpp b/Source/core/html/HTMLFrameElementBase.cpp
index 892878eda97acaa7506f50579f9ddc4eccddbb99..c7569db6cdcb94b1c247866275a4cd800a865751 100644
--- a/Source/core/html/HTMLFrameElementBase.cpp
+++ b/Source/core/html/HTMLFrameElementBase.cpp
@@ -82,6 +82,14 @@ void HTMLFrameElementBase::openURL(bool lockBackForwardList)
     if (!parentFrame)
         return;
 
+    // Force layout before loading a subframe because the frame may need to know
+    // its dimensions and we don't want the frame to waste effort laying out
+    // with incorrect dimensions.
+    //
+    // FIXME: This is potentially too much work. We really only need to do
+    // enough to calculate the width and height of the subframe.
+    document()->updateLayoutIgnorePendingStylesheets();

[esprehn, 2013/07/16 00:49:41]

This isn't the right place to do this, you're going to cause hundreds of layouts
and recalc styles on pages with iframes as the parser appends them to the
document.

+
     parentFrame->loader()->subframeLoader()->requestFrame(this, m_URL, m_frameName, lockBackForwardList);
 }