Add PlatformPictureSkia and RecordingPlatformDeviceSkia.

skia/ext/platform_picture_skia.cc

+// Copyright (c) 2012 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_picture_skia.h"
+
+#include "skia/ext/recording_platform_device_skia.h"
+#include "third_party/skia/include/utils/SkProxyCanvas.h"
+
+namespace skia {
+
+PlatformPictureSkia::PlatformPictureSkia() : record_(NULL) {
+}
+
+PlatformPictureSkia::~PlatformPictureSkia() {
+  if (record_)
+    record_->unref();
+}
+
+SkCanvas* PlatformPictureSkia::beginRecording(int width, int height) {
+  if (record_)
+    record_->unref();
+  record_ = new SkProxyCanvas;
+  record_->setProxy(picture_.beginRecording(width, height));
+
+  // Set device to handle platform paint.
+  SkDevice* device = RecordingPlatformDeviceSkia::Create(
+      &picture_, width, height);
+  record_->setDevice(device);
+  device->unref();  // Created with refcount 1, and setDevice refs.
+
+  return record_;
+}
+
+void PlatformPictureSkia::endRecording() {
+  picture_.endRecording();
+
+  if (record_) {
+    record_->unref();
+    record_ = NULL;
+  }
+}
+
+void PlatformPictureSkia::drawInto(SkCanvas* canvas) {
+  canvas->drawPicture(picture_);
+}
+
+}  // namespace skia