Fix video hang after around 60 seconds.

client/site_tests/realtimecomm_GTalkPlayground/realtimecomm_GTalkPlayground.py

Index: client/site_tests/realtimecomm_GTalkPlayground/realtimecomm_GTalkPlayground.py
diff --git a/client/site_tests/realtimecomm_GTalkPlayground/realtimecomm_GTalkPlayground.py b/client/site_tests/realtimecomm_GTalkPlayground/realtimecomm_GTalkPlayground.py
index 1cc4240021ca8eaead47f26fb5e206a59fec0d75..20f7da50dc497520bd3918cb4708e22106b866e9 100755
--- a/client/site_tests/realtimecomm_GTalkPlayground/realtimecomm_GTalkPlayground.py
+++ b/client/site_tests/realtimecomm_GTalkPlayground/realtimecomm_GTalkPlayground.py
@@ -76,9 +76,11 @@ class realtimecomm_GTalkPlayground(test.test):
         page = 'videoplayground.html'
         para = 'callType=v'
         playground_url = "%s/%s?%s" % (path, page, para)
-        session = site_ui.ChromeSession(playground_url)
-        time.sleep(60)
-        session.close()
+        utils.run('su chronos -c \'DISPLAY=:0 \
+            XAUTHORITY=/home/chronos/.Xauthority \
+            /opt/google/chrome/chrome \
+            --no-first-run %s\' &' % playground_url)
+        time.sleep(120)
 
         # Verify log
         self.run_verification()