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/doc/header.html b/doc/header.html
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+<html>
+<head>
+<title>
+JsonCpp - JSON data format manipulation library
+</title>
+<link href="doxygen.css" rel="stylesheet" type="text/css">
+<link href="tabs.css" rel="stylesheet" type="text/css">
+</head>
+
+<body bgcolor="#ffffff"> 
+<table width="100%">
+  <tr>
+    <td width="40%" align="left" valign="center">
+      <a href="http://sourceforge.net/projects/jsoncpp/">
+      JsonCpp project page
+      </a>
+    </td>
+    <td width="40%" align="right" valign="center">
+      <a href="http://jsoncpp.sourceforge.net">JsonCpp home page</a>
+    </td>
+  </tr>
+</table>
+
+<hr>
diff --git a/doc/jsoncpp.dox b/doc/jsoncpp.dox
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+/**
+\mainpage
+\section _intro Introduction
+
+<a HREF="http://www.json.org/">JSON (JavaScript Object Notation)</a>
+ is a lightweight data-interchange format. 
+It can represent integer, real number, string, an ordered sequence of value, and
+a collection of name/value pairs.
+
+Here is an example of JSON data:
+\verbatim
+// Configuration options
+{
+    // Default encoding for text
+    "encoding" : "UTF-8",
+    
+    // Plug-ins loaded at start-up
+    "plug-ins" : [
+        "python",
+        "c++",
+        "ruby"
+        ],
+        
+    // Tab indent size
+    "indent" : { "length" : 3, "use_space": true }
+}
+\endverbatim
+
+\section _features Features
+- read and write JSON document
+- attach C and C++ style comments to element during parsing
+- rewrite JSON document preserving original comments
+
+Notes: Comments used to be supported in JSON but where removed for 
+portability (C like comments are not supported in Python). Since
+comments are useful in configuration/input file, this feature was
+preserved.
+
+\section _example Code example
+
+\code
+Json::Value root;   // will contains the root value after parsing.
+Json::Reader reader;
+bool parsingSuccessful = reader.parse( config_doc, root );
+if ( !parsingSuccessful )
+{
+    // report to the user the failure and their locations in the document.
+    std::cout  << "Failed to parse configuration\n"
+               << reader.getFormattedErrorMessages();
+    return;
+}
+
+// Get the value of the member of root named 'encoding', return 'UTF-8' if there is no
+// such member.
+std::string encoding = root.get("encoding", "UTF-8" ).asString();
+// Get the value of the member of root named 'encoding', return a 'null' value if
+// there is no such member.
+const Json::Value plugins = root["plug-ins"];
+for ( int index = 0; index < plugins.size(); ++index )  // Iterates over the sequence elements.
+   loadPlugIn( plugins[index].asString() );
+   
+setIndentLength( root["indent"].get("length", 3).asInt() );
+setIndentUseSpace( root["indent"].get("use_space", true).asBool() );
+
+// ...
+// At application shutdown to make the new configuration document:
+// Since Json::Value has implicit constructor for all value types, it is not
+// necessary to explicitly construct the Json::Value object:
+root["encoding"] = getCurrentEncoding();
+root["indent"]["length"] = getCurrentIndentLength();
+root["indent"]["use_space"] = getCurrentIndentUseSpace();
+
+Json::StyledWriter writer;
+// Make a new JSON document for the configuration. Preserve original comments.
+std::string outputConfig = writer.write( root );
+
+// You can also use streams.  This will put the contents of any JSON
+// stream at a particular sub-value, if you'd like.
+std::cin >> root["subtree"];
+
+// And you can write to a stream, using the StyledWriter automatically.
+std::cout << root;
+\endcode
+
+\section _pbuild Build instructions
+The build instructions are located in the file 
+<a HREF="README.txt">README.txt</a> in the top-directory of the project.
+
+Permanent link to the latest revision of the file in subversion: 
+<a HREF="http://jsoncpp.svn.sourceforge.net/viewvc/jsoncpp/trunk/jsoncpp/README.txt?view=markup">latest README.txt</a>
+
+\section _pdownload Download
+The sources can be downloaded from 
+<a HREF="http://sourceforge.net/projects/jsoncpp/files/">SourceForge download page</a>.
+
+The latest version of the source is available in the project's subversion repository: 
+<a HREF="http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/">
+http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/</a>
+
+To checkout the source, see the following 
+<a HREF="http://sourceforge.net/scm/?type=svn&group_id=144446">instructions</a>.
+
+\section _news What's New?
+The description of latest changes can be found in 
+<a HREF="NEWS.txt">NEWS.txt</a> in the top-directory of the project.
+
+Permanent link to the latest revision of the file in subversion: 
+<a HREF="http://svn.sourceforge.net/viewcvs.cgi/jsoncpp/README.txt?view=markup">latest NEWS.txt</a>
+
+\section _plinks Project links
+- <a HREF="http://jsoncpp.sourceforge.net">json-cpp home</a>
+- <a HREF="http://www.sourceforge.net/projects/jsoncpp/">json-cpp sourceforge project</a>
+
+\section _rlinks Related links
+- <a HREF="http://www.json.org/">JSON</a> Specification and alternate language implementations.
+- <a HREF="http://www.yaml.org/">YAML</a> A data format designed for human readability.
+- <a HREF="http://www.cl.cam.ac.uk/~mgk25/unicode.html">UTF-8 and Unicode FAQ</a>.
+
+\section _license License
+See file <a HREF="LICENSE">LICENSE</a> in the top-directory of the project.
+
+Basically JsonCpp is licensed under MIT license, or public domain if desired 
+and recognized in your jurisdiction.
+
+\author Baptiste Lepilleur <blep@users.sourceforge.net>
+*/
diff --git a/doc/roadmap.dox b/doc/roadmap.dox
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+/*! \page roadmap JsonCpp roadmap
+  \section ms_release Makes JsonCpp ready for release
+  - Build system clean-up:
+	- Fix build on Windows (shared-library build is broken)
+	- Add enable/disable flag for static and shared library build
+	- Enhance help
+  - Platform portability check: (Notes: was ok on last check)
+	- linux/gcc, 
+	- solaris/cc, 
+	- windows/msvc678, 
+	- aix/vacpp
+  - Add JsonCpp version to header as numeric for use in preprocessor test
+  - Remove buggy experimental hash stuff
+  \section ms_strict Adds a strict mode to reader/parser
+	Strict JSON support as specific in RFC 4627 (http://www.ietf.org/rfc/rfc4627.txt?number=4627).
+	- Enforce only object or array as root element
+	- Disable comment support
+    - Get jsonchecker failing tests to pass in strict mode
+  \section ms_writer Writter control
+    Provides more control to determine how specific items are serialized when JSON allow choice:
+	- Optionally allow escaping of non-ASCII characters using unicode escape sequence "\\u".
+	- Optionally allow escaping of "/" using "\/".
+  \section ms_separation Expose json reader/writer API that do not impose using Json::Value.
+	Some typical use-case involve an application specific structure to/from a JSON document.
+    - Event base parser to allow unserializing a Json document directly in datastructure instead of
+      using the intermediate Json::Value.
+    - Stream based parser to serialized a Json document without using Json::Value as input.
+	- Performance oriented parser/writer:
+		- Provides an event based parser. Should allow pulling & skipping events for ease of use.
+		- Provides a JSON document builder: fast only.
+  \section ms_perfo Performance tuning
+    - Provides support for static property name definition avoiding allocation 
+    - Static property dictionnary can be provided to JSON reader
+    - Performance scenario & benchmarking
+  \section testing Testing
+    - Adds more tests for unicode parsing (e.g. including surrogate and error detection).
+*/