Revert of Delete Mac & Cairo skia::BitmapPlatformDevice impls

skia/ext/bitmap_platform_device.h

Index: skia/ext/bitmap_platform_device.h
diff --git a/skia/ext/bitmap_platform_device.h b/skia/ext/bitmap_platform_device.h
new file mode 100644
index 0000000000000000000000000000000000000000..1ca5f7e128a393024cc50b2472e12d7ba83f9e65
--- /dev/null
+++ b/skia/ext/bitmap_platform_device.h
@@ -0,0 +1,23 @@
+// 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.
+
+#ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_H_
+#define SKIA_EXT_BITMAP_PLATFORM_DEVICE_H_
+
+// This file provides an easy way to include the appropriate
+// BitmapPlatformDevice header file for your platform.
+
+#include <stdint.h>
+
+#if defined(WIN32)
+#include "skia/ext/bitmap_platform_device_win.h"
+#elif defined(__APPLE__)
+#include "skia/ext/bitmap_platform_device_mac.h"
+#elif defined(USE_CAIRO)
+#include "skia/ext/bitmap_platform_device_cairo.h"
+#else
+#include "skia/ext/bitmap_platform_device_skia.h"
+#endif
+
+#endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_H_