rebaseline_server: extend returned JSON dict to allow for result-editing in coming CL

gm/rebaseline_server/results.py

Index: gm/rebaseline_server/results.py
===================================================================
--- gm/rebaseline_server/results.py	(revision 11659)
+++ gm/rebaseline_server/results.py	(working copy)
@@ -78,6 +78,7 @@
          "testData": # list of test results, with a dictionary for each
          [
            {
+             "index": 0,   # index of this result within testData list

[epoger, 2013/10/09 05:52:16]

We may or may not use these indices when sending modifications back to the
server... but they will definitely be useful for tracking checked/unchecked test
results on the client side.

              "builder": "Test-Mac10.6-MacMini4.1-GeForce320M-x86-Debug",
              "test": "bigmatrix",
              "config": "8888",
@@ -202,6 +203,7 @@
 
           (test, config) = IMAGE_FILENAME_RE.match(image_name).groups()
           results_for_this_test = {
+              "index": len(test_data),
               "builder": builder,
               "test": test,
               "config": config,