Fix RTL scroll bars being misrendered on Android.

Source/core/platform/ScrollbarTheme.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 190 matching lines @@
     }
     result.moveBy(-scrollbar->location());
     scrollbar->invalidateRect(result);
 }
 
 void ScrollbarTheme::splitTrack(ScrollbarThemeClient* scrollbar, const IntRect& unconstrainedTrackRect, IntRect& beforeThumbRect, IntRect& thumbRect, IntRect& afterThumbRect)
 {
     // This function won't even get called unless we're big enough to have some combination of these three rects where at least
     // one of them is non-empty.
     IntRect trackRect = constrainTrackRectToTrackPieces(scrollbar, unconstrainedTrackRect);
-    int thickness = scrollbar->orientation() == HorizontalScrollbar ? scrollbar->height() : scrollbar->width();
     int thumbPos = thumbPosition(scrollbar);
     if (scrollbar->orientation() == HorizontalScrollbar) {
-        thumbRect = IntRect(trackRect.x() + thumbPos, trackRect.y() + (trackRect.height() - thickness) / 2, thumbLength(scrollbar), thickness);
+        thumbRect = IntRect(trackRect.x() + thumbPos, trackRect.y(), thumbLength(scrollbar), scrollbar->height());
         beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), thumbPos + thumbRect.width() / 2, trackRect.height());
         afterThumbRect = IntRect(trackRect.x() + beforeThumbRect.width(), trackRect.y(), trackRect.maxX() - beforeThumbRect.maxX(), trackRect.height());
     } else {
-        thumbRect = IntRect(trackRect.x() + (trackRect.width() - thickness) / 2, trackRect.y() + thumbPos, thickness, thumbLength(scrollbar));
+        thumbRect = IntRect(trackRect.x(), trackRect.y() + thumbPos, scrollbar->width(), thumbLength(scrollbar));
         beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), trackRect.width(), thumbPos + thumbRect.height() / 2);
         afterThumbRect = IntRect(trackRect.x(), trackRect.y() + beforeThumbRect.height(), trackRect.width(), trackRect.maxY() - beforeThumbRect.maxY());
     }
 }
 
 // Returns the size represented by track taking into account scrolling past
 // the end of the document.
 static float usedTotalSize(ScrollbarThemeClient* scrollbar)
 {
     float overhangAtStart = -scrollbar->currentPos();
@@ skipping 73 matching lines @@
 void ScrollbarTheme::paintOverhangBackground(ScrollView*, GraphicsContext* context, const IntRect& horizontalOverhangRect, const IntRect& verticalOverhangRect, const IntRect& dirtyRect)
 {
     context->setFillColor(Color::white);
     if (!horizontalOverhangRect.isEmpty())
         context->fillRect(intersection(horizontalOverhangRect, dirtyRect));
     if (!verticalOverhangRect.isEmpty())
         context->fillRect(intersection(verticalOverhangRect, dirtyRect));
 }
 
 }