Avoid redundant initialization of GraphicsContextState.

Source/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 444 matching lines @@
 
     // Apply deferred paint state saves
     void realizePaintSave()
     {
         if (contextDisabled())
             return;
 
         if (m_paintState->saveCount()) {
             m_paintState->decrementSaveCount();
             ++m_paintStateIndex;
-            if (m_paintStateStack.size() == m_paintStateIndex)
-                m_paintStateStack.append(GraphicsContextState::create());
-            GraphicsContextState* priorPaintState = m_paintState;
-            m_paintState = m_paintStateStack[m_paintStateIndex].get();
-            m_paintState->copy(priorPaintState);
+            if (m_paintStateStack.size() == m_paintStateIndex) {
+                m_paintStateStack.append(GraphicsContextState::createAndCopy(m_paintState));
+                m_paintState = m_paintStateStack[m_paintStateIndex].get();
+            } else {
+                GraphicsContextState* priorPaintState = m_paintState;
+                m_paintState = m_paintStateStack[m_paintStateIndex].get();
+                m_paintState->copy(priorPaintState);
+            }
         }
     }
 
     // Apply deferred canvas state saves
     void realizeCanvasSave()
     {
         if (!m_pendingCanvasSave || contextDisabled())
             return;
 
         m_canvas->save();
@@ skipping 52 matching lines @@
     bool m_updatingControlTints : 1;
     bool m_accelerated : 1;
     bool m_isCertainlyOpaque : 1;
     bool m_printing : 1;
     bool m_antialiasHairlineImages : 1;
 };
 
 } // namespace WebCore
 
 #endif // GraphicsContext_h