Allow the creation of a skia::PlatformCanvas from a CGContextRef.

skia/ext/platform_canvas_linux.cc

 // Copyright (c) 2006-2008 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 "skia/ext/platform_canvas.h"
 
 #include <cairo/cairo.h>
 
 #include "skia/ext/platform_device_linux.h"
 #include "skia/ext/bitmap_platform_device_linux.h"
@@ skipping 11 matching lines @@
                                uint8_t* data)
     : SkCanvas(SkNEW(BitmapPlatformDeviceFactory)) {
   if (!initialize(width, height, is_opaque, data))
     SK_CRASH();
 }
 
 PlatformCanvas::~PlatformCanvas() {
 }
 bool PlatformCanvas::initialize(int width, int height, bool is_opaque,
                                 uint8_t* data) {
-  SkDevice* device =
-      BitmapPlatformDevice::Create(width, height, is_opaque, data);
-  if (!device)
-    return false;
-
-  setDevice(device);
-  device->unref(); // was created with refcount 1, and setDevice also refs
-  return true;
+  return initializeWithDevice(BitmapPlatformDevice::Create(
+      width, height, is_opaque, data));
 }
 
 cairo_t* PlatformCanvas::beginPlatformPaint() {
   return getTopPlatformDevice().beginPlatformPaint();
 }
 
 void PlatformCanvas::endPlatformPaint() {
   // We don't need to do anything on Linux here.
 }
 
 }  // namespace skia