Clarify the size of a document view (a.k.a layout size) that causes FrameView to emit the resize ev…

Source/core/platform/ScrollView.h

Index: Source/core/platform/ScrollView.h
diff --git a/Source/core/platform/ScrollView.h b/Source/core/platform/ScrollView.h
index b8f97a38e32c714fb500c26de4bb8173bb321d14..3c7701874a01ba72785ea2eda8a444eae0f0a77f 100644
--- a/Source/core/platform/ScrollView.h
+++ b/Source/core/platform/ScrollView.h
@@ -142,6 +142,10 @@ public:
     IntSize layoutSize() const;
     int layoutWidth() const { return layoutSize().width(); }
     int layoutHeight() const { return layoutSize().height(); }
+    // The spec DOM Level 2 Events states that the resize event occurs when document view size (a.k.a layout size) is changed. Refer to http://www.w3.org/TR/DOM-Level-2-Events/events.html
+    // However, we don't want scrollbar to emit a resize event because other browsers don't have this behavior, and actual site is badly affected. Refer to webkit.org/b/80242

[kenneth.r.christiansen, 2013/05/06 19:50:51]

I don't think this explains it very well. You want to say that showing/hiding
scrollbars shouldn't be considered a layout size change?

+    // So we use layoutSizeIncludingScrollbars() to emit a resize event due to above practical reason.
+    IntSize layoutSizeIncludingScrollbars() const;
     IntSize fixedLayoutSize() const;
     void setFixedLayoutSize(const IntSize&);
     bool useFixedLayout() const;