Add JSON dependency to build.

This dependency is a mirror of the one that Chrome
uses to import jsoncpp.
Review URL: https://codereview.appspot.com/6269043

git-svn-id: http://skia.googlecode.com/svn/trunk@4251 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/DEPS b/DEPS
index 12ee85c..b6e0455 100644
--- a/DEPS
+++ b/DEPS
@@ -10,6 +10,9 @@
 deps = {
   "third_party/externals/gyp" : "http://gyp.googlecode.com/svn/trunk@1320",
   "third_party/externals/libjpeg" : "http://src.chromium.org/svn/trunk/src/third_party/libjpeg@125399",
+  "third_party/externals/jsoncpp" : "http://src.chromium.org/svn/trunk/src/third_party/jsoncpp@125399",
+  "third_party/externals/jsoncpp/source/include" : "http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/jsoncpp/include@248",
+  "third_party/externals/jsoncpp/source/src/lib_json" : "http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/jsoncpp/src/lib_json@248",
 }
 
 #hooks = [