cc: Make PaintCanvas abstract

third_party/WebKit/Source/platform/graphics/UnacceleratedImageBufferSurface.cpp

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 38 matching lines @@
                                        alphaType, colorSpace);
   SkSurfaceProps disableLCDProps(0, kUnknown_SkPixelGeometry);
   m_surface =
       SkSurface::MakeRaster(info, Opaque == opacityMode ? 0 : &disableLCDProps);
 
   if (!m_surface)
     return;
 
   // Always save an initial frame, to support resetting the top level matrix
   // and clip.
-  m_canvas = WTF::wrapUnique(new PaintCanvas(m_surface->getCanvas()));
+  m_canvas = WTF::wrapUnique(new SkiaPaintCanvas(m_surface->getCanvas()));
   m_canvas->save();
 
   if (initializationMode == InitializeImagePixels)
     clear();
 }
 
 UnacceleratedImageBufferSurface::~UnacceleratedImageBufferSurface() {}
 
 PaintCanvas* UnacceleratedImageBufferSurface::canvas() {
   return m_canvas.get();
 }
 
 bool UnacceleratedImageBufferSurface::isValid() const {
   return m_surface;
 }
 
 sk_sp<SkImage> UnacceleratedImageBufferSurface::newImageSnapshot(
     AccelerationHint,
     SnapshotReason) {
   return m_surface->makeImageSnapshot();
 }
 
 }  // namespace blink