Fix for the painting problem with drop down scroll bar

third_party/WebKit/WebCore/platform/chromium/PopupMenuChromium.cpp

Index: third_party/WebKit/WebCore/platform/chromium/PopupMenuChromium.cpp
===================================================================
--- third_party/WebKit/WebCore/platform/chromium/PopupMenuChromium.cpp	(revision 7808)
+++ third_party/WebKit/WebCore/platform/chromium/PopupMenuChromium.cpp	(working copy)
@@ -85,6 +85,9 @@
     // ScrollView
     virtual HostWindow* hostWindow() const;
 
+    // Widget
+    virtual void invalidateRect(const IntRect&);
+
     // PopupListBox methods
 
     // Show the popup
@@ -654,6 +657,15 @@
     return parent() ? parent()->hostWindow() : 0;
 }
 
+void PopupListBox::invalidateRect(const IntRect& rect)
+{
+    // Since we are returning the HostWindow of our parent as our own in
+    // hostWindow(), we need to invalidate in our parent coordinates.
+    IntRect newRect(rect);
+    newRect.move(kBorderSize, kBorderSize);
+    FramelessScrollView::invalidateRect(newRect);
+}
+
 // From HTMLSelectElement.cpp
 static String stripLeadingWhiteSpace(const String& string)
 {