Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/ViewPainter.cpp

 // Copyright 2014 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 "config.h"
 #include "core/paint/ViewPainter.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutBox.h"
@@ skipping 34 matching lines @@
     // View background painting is special in the following ways:
     // 1. The view paints background for the root element, the background positioning respects
     //    the positioning and transformation of the root element.
     // 2. CSS background-clip is ignored, the background layers always expand to cover the whole
     //    canvas. None of the stacking context effects (except transformation) on the root element
     //    affects the background.
     // 3. The main frame is also responsible for painting the user-agent-defined base background
     //    color. Conceptually it should be painted by the embedder but painting it here allows
     //    culling and pre-blending optimization when possible.
 
-    GraphicsContext& context = *paintInfo.context;
+    GraphicsContext& context = paintInfo.context;
     if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, m_layoutView, DisplayItem::BoxDecorationBackground, LayoutPoint()))
         return;
 
     IntRect documentRect = m_layoutView.documentRect();
     const Document& document = m_layoutView.document();
     const FrameView& frameView = *m_layoutView.frameView();
     bool isMainFrame = !document.ownerElement();
     bool paintsBaseBackground = isMainFrame && !frameView.isTransparent();
     bool shouldClearCanvas = paintsBaseBackground && (document.settings() && document.settings()->shouldClearDocumentBackground());
     Color baseBackgroundColor = paintsBaseBackground ? frameView.baseBackgroundColor() : Color();
@@ skipping 85 matching lines @@
             BoxPainter::paintFillLayerExtended(m_layoutView, paintInfo, Color(), **it, LayoutRect(paintRect), BackgroundBleedNone);
             context.restore();
         }
     }
 
     if (shouldDrawBackgroundInSeparateBuffer)
         context.endLayer();
 }
 
 } // namespace blink