[Telemetry] Fix for Telemetry unittests on Android after r283119

BUG=337829

Review URL: https://codereview.chromium.org/402433002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283639 0039d316-1c4b-4281-b951-d872f2087c98

tools/telemetry/telemetry/core/tab_unittest.py

@@ -108,6 +108,7 @@ class TabTest(tab_test_case.TabTestCase):
         break
     self.assertTrue(found_video_start_event)
 
+  @benchmark.Enabled('has tabs')
   def testGetRendererThreadFromTabId(self):
     self.assertEquals(self._tab.url, 'about:blank')
     # Create 3 tabs. The third tab is closed before we call StartTracing.

tools/telemetry/telemetry/unittest/tab_test_case.py

@@ -40,9 +40,12 @@ class TabTestCase(unittest.TestCase):
       raise
 
   def setUp(self):
-    self._tab = self._browser.tabs.New()
-    while len(self._browser.tabs) > 1:
-      self._browser.tabs[0].Close()
+    if self._browser.supports_tab_control:
+      self._tab = self._browser.tabs.New()
+      while len(self._browser.tabs) > 1:
+        self._browser.tabs[0].Close()
+    else:
+      self._tab = self._browser.tabs[0]
     self._tab.Navigate('about:blank')
     self._tab.WaitForDocumentReadyStateToBeInteractiveOrBetter()