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

skia/ext/platform_canvas_win.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 <windows.h>
 #include <psapi.h>
 
 #include "skia/ext/bitmap_platform_device_win.h"
 #include "skia/ext/platform_canvas.h"
 
@@ skipping 49 matching lines @@
     CHECK(0);
   }
   CHECK(pmc.PagefileUsage < kLotsOfMem);
 
   // Everything else.
   CHECK(0);
 }
 
 // Crashes the process. This is called when a bitmap allocation fails but
 // unlike its cousin CrashForBitmapAllocationFailure() it tries to detect if
-// the issue was a non-valid shared bitmap handle. 
+// the issue was a non-valid shared bitmap handle.
 void CrashIfInvalidSection(HANDLE shared_section) {
   DWORD handle_info = 0;
   CHECK(::GetHandleInformation(shared_section, &handle_info) == TRUE);
 }
 
 // Restore the optimization options.
 #pragma optimize("", on)
 
 PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque)
     : SkCanvas(SkNEW(BitmapPlatformDeviceFactory)) {
@@ skipping 14 matching lines @@
   }
 }
 
 PlatformCanvas::~PlatformCanvas() {
 }
 
 bool PlatformCanvas::initialize(int width,
                                int height,
                                bool is_opaque,
                                HANDLE shared_section) {
-  SkDevice* device = BitmapPlatformDevice::create(width, height,
-                                                  is_opaque, shared_section);
-  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, shared_section));
 }
 
 HDC PlatformCanvas::beginPlatformPaint() {
   return getTopPlatformDevice().getBitmapDC();
 }
 
 void PlatformCanvas::endPlatformPaint() {
   // we don't clear the DC here since it will be likely to be used again
   // flushing will be done in onAccessBitmap
 }
 
 }  // namespace skia