Added tab-to-tab apprtc call.

chrome/test/functional/webrtc_apprtc_call.py

Index: chrome/test/functional/webrtc_apprtc_call.py
diff --git a/chrome/test/functional/webrtc_apprtc_call.py b/chrome/test/functional/webrtc_apprtc_call.py
index 477399b0fabee71bba3c196a6afb9df3fc7312ae..da71a978738e75dfc7a7a64dbaf7ca0a5c2cb86d 100755
--- a/chrome/test/functional/webrtc_apprtc_call.py
+++ b/chrome/test/functional/webrtc_apprtc_call.py
@@ -3,6 +3,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import random
+
 # Note: pyauto_functional must come before pyauto.
 import pyauto_functional
 import pyauto
@@ -25,13 +27,29 @@ class WebrtcApprtcCallTest(webrtc_test_base.WebrtcTestBase):
     self.assertEquals('', self.CheckErrorsAndCrashes(),
                       'Chrome crashed or hit a critical error during test.')
 
-  def testApprtcLoopbackVideoAudioCall(self):
+  def testApprtcLoopbackCall(self):
     self.NavigateToURL('http://apprtc.appspot.com/?debug=loopback')
     self.WaitForInfobarCount(1, tab_index=0)
     self.PerformActionOnInfobar('accept', infobar_index=0, tab_index=0)
 
     self._WaitForCallEstablishment(tab_index=0)
 
+  def testApprtcTabToTabCall(self):
+    random_call_id = 'pyauto%d' % random.randint(0, 65536)

[dennis_jeffrey, 2012/12/19 18:13:32]

what benefit do we get by using a random int in the call_id here?  Could we just
use a constant value?

I'd just like to know whether it's worthwhile to add non-determinism to this
test, since (in general) non-determinism could potentially be a source of
flakiness.  If it serves a particular purpose here, it may help to add a comment
to the code explaining why.

[phoglund_chromium, 2013/01/02 10:18:55]

The ID is used to refer to a call session, which is why we use one here to get
the two tabs into the same call. The random ID is here since the apprtc service
is stateful - if we used the same ID I can imagine that we would get problems
with hung calls and similar issues. I'll add a comment about it.

+    apprtc_url = 'http://apprtc.appspot.com/?r=%s' % random_call_id
+
+    self.NavigateToURL(apprtc_url)
+    self.AppendTab(pyauto.GURL(apprtc_url))
+
+    self.WaitForInfobarCount(1, tab_index=0)
+    self.WaitForInfobarCount(1, tab_index=1)
+
+    self.PerformActionOnInfobar('accept', infobar_index=0, tab_index=0)
+    self.PerformActionOnInfobar('accept', infobar_index=0, tab_index=1)
+
+    self._WaitForCallEstablishment(tab_index=0)
+    self._WaitForCallEstablishment(tab_index=1)
+
   def _WaitForCallEstablishment(self, tab_index):
     # AppRTC will set opacity to 1 for remote video when the call is up.
     video_playing = self.WaitUntil(