Convert some call sites to use explicit LayoutRect->FloatRect conversion.

Source/core/layout/LayoutPart.cpp

Index: Source/core/layout/LayoutPart.cpp
diff --git a/Source/core/layout/LayoutPart.cpp b/Source/core/layout/LayoutPart.cpp
index 7c06c2691ad27befcc59579db36081c3b927dc9b..81cd54bf1e1324ecab7af1dc2023757b8c868bea 100644
--- a/Source/core/layout/LayoutPart.cpp
+++ b/Source/core/layout/LayoutPart.cpp
@@ -297,7 +297,7 @@ bool LayoutPart::updateWidgetGeometry()
     ASSERT(widget);
 
     LayoutRect contentBox = contentBoxRect();
-    LayoutRect absoluteContentBox(localToAbsoluteQuad(FloatQuad(contentBox)).boundingBox());
+    LayoutRect absoluteContentBox(localToAbsoluteQuad(FloatQuad(FloatRect(contentBox))).boundingBox());

[eae, 2015/08/25 17:47:17]

Might be easier to add a FloatQuad constructor that takes a LayoutRect? I'll
leave that up to you though.

[chrishtr, 2015/08/25 18:30:44]

I'd prefer not to, to make the performance more obvious to future developers.

     if (widget->isFrameView()) {
         contentBox.setLocation(absoluteContentBox.location());
         return setWidgetGeometry(contentBox);