Check in jsoncpp.

Check in ab1e40f3bce061ea6f9bdc60351d6cde2a4f872b from
https://chromium.googlesource.com/external/jsoncpp/jsoncpp.git

This is the version used by Skia's test suite.

BUG:15087860

Change-Id: I16bf6ac927fa025b6527b48221d749484e1a04f4
diff --git a/include/json/forwards.h b/include/json/forwards.h
new file mode 100644
index 0000000..ab863da
--- /dev/null
+++ b/include/json/forwards.h
@@ -0,0 +1,44 @@
+// Copyright 2007-2010 Baptiste Lepilleur
+// Distributed under MIT license, or public domain if desired and
+// recognized in your jurisdiction.
+// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
+#ifndef JSON_FORWARDS_H_INCLUDED
+# define JSON_FORWARDS_H_INCLUDED
+
+#if !defined(JSON_IS_AMALGAMATION)
+# include "config.h"
+#endif // if !defined(JSON_IS_AMALGAMATION)
+
+namespace Json {
+
+   // writer.h
+   class FastWriter;
+   class StyledWriter;
+
+   // reader.h
+   class Reader;
+
+   // features.h
+   class Features;
+
+   // value.h
+   typedef unsigned int ArrayIndex;
+   class StaticString;
+   class Path;
+   class PathArgument;
+   class Value;
+   class ValueIteratorBase;
+   class ValueIterator;
+   class ValueConstIterator;
+#ifdef JSON_VALUE_USE_INTERNAL_MAP
+   class ValueMapAllocator;
+   class ValueInternalLink;
+   class ValueInternalArray;
+   class ValueInternalMap;
+#endif // #ifdef JSON_VALUE_USE_INTERNAL_MAP
+
+} // namespace Json
+
+
+#endif // JSON_FORWARDS_H_INCLUDED