[gnome-shell] hwtest.js: Don't parse JSON with regexps

[Owen Taylor <otaylor src gnome org>]

commit 46c86e093c35ed2c8d2ad4e93ddc0cbe5d55f76d
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Wed Jul 16 13:20:15 2014 -0400

    hwtest.js: Don't parse JSON with regexps
    
    Use JSON.parse() to parse systemd log records, rather than using
    regexps.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732350

 js/perf/hwtest.js |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/js/perf/hwtest.js b/js/perf/hwtest.js
index 1f0b181..8ef6102 100644
--- a/js/perf/hwtest.js
+++ b/js/perf/hwtest.js
@@ -78,7 +78,7 @@ function extractBootTimestamp() {
                                  'MESSAGE_ID=7d4958e842da4a758f6c1cdc7b36dcc5',
                                  'UNIT=graphical.target',
                                  '-o',
-                                 'json-pretty'],
+                                 'json'],
                                 Gio.SubprocessFlags.STDOUT_PIPE);
     let result = null;
 
@@ -88,10 +88,8 @@ function extractBootTimestamp() {
         if (line === null)
             break;
 
-        let m = /.*"__MONOTONIC_TIMESTAMP".*"([0-9]+)"/.exec(line);
-        if (m) {
-            result = Number(m[1]);
-        }
+        let fields = JSON.parse(line);
+        result = Number(fields['__MONOTONIC_TIMESTAMP']);
     }
     datastream.close(null);
     return result;