Move skia to DEPS, and put it in third_party.

skia/config/win/stdint.h

+// Copyright (c) 2009 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.
+
+// skia is written in C99 and requires <stdint.h> and <inttypes.h>.
+// Since MSVC doesn't include these headers, we have to write our own version
+// to provide a compatibility layer between MSVC and skia
+
+#ifndef SKIA_CONFIG_WIN_STDINT_H_
+#define SKIA_CONFIG_WIN_STDINT_H
+
+#if !defined(_MSC_VER)
+#error This file should only be included when compiling with MSVC.
+#endif
+
+// Define C99 equivalent types.
+typedef signed char           int8_t;
+typedef signed short          int16_t;
+typedef signed int            int32_t;
+typedef signed long long      int64_t;
+typedef unsigned char         uint8_t;
+typedef unsigned short        uint16_t;
+typedef unsigned int          uint32_t;
+typedef unsigned long long    uint64_t;
+
+#endif  // SKIA_CONFIG_WIN_STDINT_H