cc: Init PaintedScrollbarLayer::internal_contents_scale_ to 1.

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/basictypes.h"
@@ skipping 28 matching lines @@
       new PaintedScrollbarLayer(settings, scrollbar.Pass(), scroll_layer_id));
 }
 
 PaintedScrollbarLayer::PaintedScrollbarLayer(const LayerSettings& settings,
                                              scoped_ptr<Scrollbar> scrollbar,
                                              int scroll_layer_id)
     : Layer(settings),
       scrollbar_(scrollbar.Pass()),
       scroll_layer_id_(scroll_layer_id),
       clip_layer_id_(Layer::INVALID_ID),
-      internal_contents_scale_(0.f),
+      internal_contents_scale_(1.f),
       thumb_thickness_(scrollbar_->ThumbThickness()),
       thumb_length_(scrollbar_->ThumbLength()),
       is_overlay_(scrollbar_->IsOverlay()),
       has_thumb_(scrollbar_->HasThumb()) {
   if (!scrollbar_->IsOverlay())
     SetShouldScrollOnMainThread(true);
 }
 
 PaintedScrollbarLayer::~PaintedScrollbarLayer() {}
 
@@ skipping 256 matching lines @@
 
   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