Revert of Delete Mac & Cairo skia::BitmapPlatformDevice impls

skia/ext/bitmap_platform_device_skia.cc

 // Copyright 2013 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/bitmap_platform_device_skia.h"
 #include "skia/ext/platform_canvas.h"
 
 namespace skia {
 
 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
                                                    bool is_opaque) {
-  return Create(width, height, is_opaque, nullptr);
+  SkBitmap bitmap;
+  if (bitmap.tryAllocN32Pixels(width, height, is_opaque)) {
+    // Follow the logic in SkCanvas::createDevice(), initialize the bitmap if it
+    // is not opaque.
+    if (!is_opaque)
+      bitmap.eraseARGB(0, 0, 0, 0);
+    return new BitmapPlatformDevice(bitmap);
+  }
+  return NULL;
 }
 
 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
                                                    bool is_opaque,
                                                    uint8_t* data) {
   SkBitmap bitmap;
   bitmap.setInfo(SkImageInfo::MakeN32(width, height,
       is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType));
-
-  if (data) {
+  if (data)
     bitmap.setPixels(data);
-  } else {
-      if (!bitmap.tryAllocPixels())
-        return nullptr;
-      // Follow the logic in SkCanvas::createDevice(), initialize the bitmap if
-      // it is not opaque.
-      if (!is_opaque)
-        bitmap.eraseARGB(0, 0, 0, 0);
-  }
+  else if (!bitmap.tryAllocPixels())
+    return NULL;
 
   return new BitmapPlatformDevice(bitmap);
 }
 
 BitmapPlatformDevice::BitmapPlatformDevice(const SkBitmap& bitmap)
     : SkBitmapDevice(bitmap) {
   SetPlatformDevice(this, this);
 }
 
 BitmapPlatformDevice::~BitmapPlatformDevice() {
 }
 
 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& info,
                                                    const SkPaint*) {
   SkASSERT(info.fInfo.colorType() == kN32_SkColorType);
   return BitmapPlatformDevice::Create(info.fInfo.width(), info.fInfo.height(),
                                       info.fInfo.isOpaque());
 }
 
+NativeDrawingContext BitmapPlatformDevice::BeginPlatformPaint(
+    const SkMatrix& transform,
+    const SkIRect& clip_bounds) {
+  // TODO(zhenghao): What should we return? The ptr to the address of the
+  // pixels? Maybe this won't be called at all.
+  SkPixmap pixmap;
+  return accessPixels(&pixmap) ? pixmap.writable_addr() : nullptr;
+}
+
 // PlatformCanvas impl
 
 std::unique_ptr<SkCanvas> CreatePlatformCanvasWithPixels(
     int width,
     int height,
     bool is_opaque,
     uint8_t* data,
     OnFailureType failureType) {
   sk_sp<SkBaseDevice> dev(
       BitmapPlatformDevice::Create(width, height, is_opaque, data));
   return CreateCanvas(dev, failureType);
 }
 
 }  // namespace skia