Left side vertical MD scrollbars grow toward right.

cc/test/fake_scrollbar.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/fake_scrollbar.h"
 
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 FakeScrollbar::FakeScrollbar()
-    : paint_(false),
-      has_thumb_(false),
-      is_overlay_(false),
-      thumb_thickness_(10),
-      thumb_length_(5),
-      thumb_opacity_(1),
-      needs_paint_thumb_(true),
-      needs_paint_track_(true),
-      track_rect_(0, 0, 100, 10),
-      fill_color_(SK_ColorGREEN) {}
+    : FakeScrollbar(false, false, HORIZONTAL, false, false) {}
 
 FakeScrollbar::FakeScrollbar(bool paint, bool has_thumb, bool is_overlay)
+    : FakeScrollbar(paint, has_thumb, HORIZONTAL, false, is_overlay) {}
+
+FakeScrollbar::FakeScrollbar(bool paint,
+                             bool has_thumb,
+                             ScrollbarOrientation orientation,
+                             bool is_left_side_vertical_scrollbar,
+                             bool is_overlay)
     : paint_(paint),
       has_thumb_(has_thumb),
+      orientation_(orientation),
+      is_left_side_vertical_scrollbar_(is_left_side_vertical_scrollbar),
       is_overlay_(is_overlay),
       thumb_thickness_(10),
       thumb_length_(5),
       thumb_opacity_(1),
       needs_paint_thumb_(true),
       needs_paint_track_(true),
       track_rect_(0, 0, 100, 10),
       fill_color_(SK_ColorGREEN) {}
 
 FakeScrollbar::~FakeScrollbar() {}
 
 ScrollbarOrientation FakeScrollbar::Orientation() const {
-  return HORIZONTAL;
+  return orientation_;
 }
 
 bool FakeScrollbar::IsLeftSideVerticalScrollbar() const {
-  return false;
+  return is_left_side_vertical_scrollbar_;
 }
 
 gfx::Point FakeScrollbar::Location() const { return location_; }
 
 bool FakeScrollbar::IsOverlay() const { return is_overlay_; }
 
 bool FakeScrollbar::HasThumb() const { return has_thumb_; }
 
 int FakeScrollbar::ThumbThickness() const {
   return thumb_thickness_;
@@ skipping 31 matching lines @@
   paint.setStyle(SkPaint::kFill_Style);
 
   // Emulate the how the real scrollbar works by using scrollbar's rect for
   // TRACK and the given content_rect for the THUMB
   SkRect rect = part == TRACK ? RectToSkRect(TrackRect())
                               : RectToSkRect(content_rect);
   canvas->drawRect(rect, paint);
 }
 
 }  // namespace cc