Split GM json schema out of display_json_results.py, for sharing with other tools

R=rmistry@google.com

Review URL: https://codereview.chromium.org/16155002

git-svn-id: http://skia.googlecode.com/svn/trunk@9290 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/gm_expectations.cpp b/gm/gm_expectations.cpp
index 8138af7..08461bd 100644
--- a/gm/gm_expectations.cpp
+++ b/gm/gm_expectations.cpp
@@ -12,7 +12,7 @@
 #define DEBUGFAIL_SEE_STDERR SkDEBUGFAIL("see stderr for message")
 
 // These constants must be kept in sync with the JSONKEY_ constants in
-// display_json_results.py !
+// gm_json.py !
 const static char kJsonKey_ActualResults[]   = "actual-results";
 const static char kJsonKey_ActualResults_Failed[]        = "failed";
 const static char kJsonKey_ActualResults_FailureIgnored[]= "failure-ignored";