Use skia::RefPtr to avoid having to manually refcount GraphicsContextState::m_looper.

Source/core/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 275 matching lines @@
     drawLooper.addShadow(offset, blur, color, shadowTransformMode, shadowAlphaMode);
     drawLooper.addUnmodifiedContent();
     setDrawLooper(drawLooper);
 }
 
 void GraphicsContext::setDrawLooper(const DrawLooper& drawLooper)
 {
     if (paintingDisabled())
         return;
 
-    setDrawLooper(drawLooper.skDrawLooper());
+    m_state->m_looper = drawLooper.skDrawLooper();
 }
 
 void GraphicsContext::clearDrawLooper()
 {
     if (paintingDisabled())
         return;
 
-    setDrawLooper(0);
+    m_state->m_looper.clear();
 }
 
 bool GraphicsContext::hasShadow() const
 {
     return !!m_state->m_looper;
 }
 
 int GraphicsContext::getNormalizedAlpha() const
 {
     int alpha = roundf(m_state->m_alpha * 256);
@@ skipping 1402 matching lines @@
 {
 #if defined(SK_DEBUG)
     {
         SkPaint defaultPaint;
         SkASSERT(*paint == defaultPaint);
     }
 #endif
 
     paint->setAntiAlias(m_state->m_shouldAntialias);
     paint->setXfermodeMode(m_state->m_xferMode);
-    paint->setLooper(m_state->m_looper);
+    paint->setLooper(m_state->m_looper.get());
 }
 
 void GraphicsContext::drawOuterPath(const SkPath& path, SkPaint& paint, int width)
 {
 #if OS(DARWIN)
     paint.setAlpha(64);
     paint.setStrokeWidth(width);
     paint.setPathEffect(new SkCornerPathEffect((width - 1) * 0.5f))->unref();
 #else
     paint.setStrokeWidth(1);
@@ skipping 157 matching lines @@
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "PlatformContextSkia::trackTextRegion");
         m_textRegion.join(textRect);
     }
 }
 
 }