Update DM JSON format.

tools/flags/SkCommonFlags.cpp

Index: tools/flags/SkCommonFlags.cpp
diff --git a/tools/flags/SkCommonFlags.cpp b/tools/flags/SkCommonFlags.cpp
index 7776c36a59d30470f4278a5272f6ca9c9bafddab..c8cd330f59e775ed9ad757680ecfb7b329971a33 100644
--- a/tools/flags/SkCommonFlags.cpp
+++ b/tools/flags/SkCommonFlags.cpp
@@ -51,3 +51,9 @@ DEFINE_bool2(verbose, v, false, "enable verbose output from the test driver.");
 DEFINE_bool2(veryVerbose, V, false, "tell individual tests to be verbose.");
 
 DEFINE_string2(writePath, w, "", "If set, write bitmaps here as .pngs.");
+
+DEFINE_string(key, "",
+              "Space-separated key/value pairs to add to JSON identifying this builder.");
+DEFINE_string(properties, "",
+              "Space-separated key/value pairs to add to JSON identifying this run.");
+