Fixes calling Restore() without Save() in ui::Layer

ui/compositor/layer.cc

 // Copyright (c) 2012 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 "ui/compositor/layer.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 410 matching lines @@
   for (size_t i = 0; i < children_.size(); ++i)
     children_[i]->OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
 void Layer::paintContents(WebKit::WebCanvas* web_canvas,
                           const WebKit::WebRect& clip) {
   TRACE_EVENT0("ui", "Layer::paintContents");
   gfx::Canvas canvas(web_canvas);
   bool scale_content = scale_content_;
   if (scale_content) {
+    canvas.Save();
     canvas.sk_canvas()->scale(SkFloatToScalar(device_scale_factor_),
                               SkFloatToScalar(device_scale_factor_));
   }
   if (delegate_)
     delegate_->OnPaintLayer(&canvas);
   if (scale_content)
     canvas.Restore();
 }
 
 void Layer::SetForceRenderSurface(bool force) {
@@ skipping 225 matching lines @@
     return;
   unsigned int color = 0xFF000000;
   color |= web_layer_is_accelerated_ ? 0x0000FF00 : 0x00FF0000;
   bool opaque = fills_bounds_opaquely_ && (GetCombinedOpacity() == 1.f);
   if (!opaque)
     color |= 0xFF;
   web_layer_.setDebugBorderColor(color);
 }
 
 }  // namespace ui