Scale scrollbar in use-zoom-for-dsf mode

cc/layers/painted_scrollbar_layer.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/layers/painted_scrollbar_layer.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 269 matching lines @@
   DCHECK(!layer_rect.size().IsEmpty());
 
   SkBitmap skbitmap;
   skbitmap.allocN32Pixels(content_rect.width(), content_rect.height());
   SkCanvas skcanvas(skbitmap);
 
   float scale_x =
       content_rect.width() / static_cast<float>(layer_rect.width());
   float scale_y =
       content_rect.height() / static_cast<float>(layer_rect.height());
+  LOG(ERROR) << "scale:" << scale_x << "x" << scale_y

[skobes, 2016/01/14 00:00:36]

remove this :)

+             << ", content rect:" << content_rect.ToString()
+             << ", layer rect:" << layer_Rect.ToString();
 
   skcanvas.scale(SkFloatToScalar(scale_x),
                  SkFloatToScalar(scale_y));
   skcanvas.translate(SkFloatToScalar(-layer_rect.x()),
                      SkFloatToScalar(-layer_rect.y()));
 
   SkRect layer_skrect = RectToSkRect(layer_rect);
   SkPaint paint;
   paint.setAntiAlias(false);
   paint.setXfermodeMode(SkXfermode::kClear_Mode);
   skcanvas.drawRect(layer_skrect, paint);
   skcanvas.clipRect(layer_skrect);
 
   scrollbar_->PaintPart(&skcanvas, part, layer_rect);
   // Make sure that the pixels are no longer mutable to unavoid unnecessary
   // allocation and copying.
   skbitmap.setImmutable();
 
   return UIResourceBitmap(skbitmap);
 }
 
 }  // namespace cc