Update use of SkCanvas and SkDevice to match change in Skia

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"
 #include "third_party/skia/include/core/SkTypes.h"
 
 namespace skia {
 
-PlatformCanvas::PlatformCanvas() : SkCanvas() {
-}
-
 PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque)
-    : SkCanvas() {
+    : SkCanvas(SkNEW(SkBitmapPlatformDeviceFactory)) {
   if (!initialize(width, height, is_opaque))
     SK_CRASH();
 }
 
 PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque,
                                uint8_t* data)
-    : SkCanvas() {
+    : SkCanvas(SkNEW(SkBitmapPlatformDeviceFactory)) {
   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;
 }
 
 cairo_t* PlatformCanvas::beginPlatformPaint() {
   return getTopPlatformDevice().beginPlatformPaint();
 }
 
 void PlatformCanvas::endPlatformPaint() {
   // We don't need to do anything on Linux here.
 }
 
-SkDevice* PlatformCanvas::createDevice(SkBitmap::Config config,
-                                       int width,
-                                       int height,
-                                       bool is_opaque,
-                                       bool isForLayer) {
-  SkASSERT(config == SkBitmap::kARGB_8888_Config);
-  return BitmapPlatformDevice::Create(width, height, is_opaque);
-}
-
 }  // namespace skia