cc: Include pictures in trace output for DisplayItemLists

cc/debug/picture_debug_util.h

+// Copyright 2015 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 CC_DEBUG_PICTURE_DEBUG_UTIL_H_
+#define CC_DEBUG_PICTURE_DEBUG_UTIL_H_
+
+#include <string>
+
+class SkPicture;
+
+namespace cc {
+
+class PictureDebugUtil {
+ public:
+  static void SerializeAsBase64(const SkPicture* picture, std::string* output);
+};
+
+}  // namespace cc
+
+#endif  // CC_DEBUG_PICTURE_DEBUG_UTIL_H_