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/src/jsontestrunner/sconscript b/src/jsontestrunner/sconscript
new file mode 100644
index 0000000..6e68e31
--- /dev/null
+++ b/src/jsontestrunner/sconscript
@@ -0,0 +1,9 @@
+Import( 'env_testing buildJSONTests' )
+
+buildJSONTests( env_testing, Split( """
+    main.cpp
+     """ ),
+    'jsontestrunner' )
+
+# For 'check' to work, 'libs' must be built first.
+env_testing.Depends('jsontestrunner', '#libs')