aura: Use platform independent skia::PlatformCanvas when possible.

skia/ext/platform_canvas_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_canvas.h"
+
+#include "base/debug/trace_event.h"
+
+namespace skia {
+
+PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque) {
+  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
+               "width", width, "height", height);
+  if (!initialize(width, height, is_opaque))
+    SK_CRASH();
+}
+
+PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque,
+                               uint8_t* data) {
+  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
+               "width", width, "height", height);
+  if (!initialize(width, height, is_opaque, data))
+    SK_CRASH();
+}
+
+PlatformCanvas::~PlatformCanvas() {
+}
+
+bool PlatformCanvas::initialize(int width, int height, bool is_opaque,
+                                uint8_t* data) {
+  return initializeWithDevice(new SkDevice(SkBitmap::kARGB_8888_Config,
+                                           width, height,
+                                           is_opaque));
+}
+
+}  // namespace skia