Add is_tracing to browser.

tools/telemetry/telemetry/core/tab_unittest.py

Index: tools/telemetry/telemetry/core/tab_unittest.py
diff --git a/tools/telemetry/telemetry/core/tab_unittest.py b/tools/telemetry/telemetry/core/tab_unittest.py
index 735205065c1a5a60f9cc0ce66a4cfc4adf54df40..ede2520e19bb560261b5a70c0b2bcf756f8501dc 100644
--- a/tools/telemetry/telemetry/core/tab_unittest.py
+++ b/tools/telemetry/telemetry/core/tab_unittest.py
@@ -13,6 +13,26 @@ def _IsDocumentVisible(tab):
   return not tab.EvaluateJavaScript('document.hidden || document.webkitHidden')
 
 
+class FakePlatform(object):
+  def __init__(self):
+    self._is_video_capture_running = False
+
+  #pylint: disable=W0613
+  def StartVideoCapture(self, min_bitrate_mbps):
+    self._is_video_capture_running = True
+
+  def StopVideoCapture(self):
+    self._is_video_capture_running = False
+    return []
+
+  def SetFullPerformanceModeEnabled(self, enabled):
+    pass
+
+  @property
+  def is_video_capture_running(self):
+    return self._is_video_capture_running
+
+
 class TabTest(tab_test_case.TabTestCase):
   def testNavigateAndWaitToForCompleteState(self):
     self._browser.SetHTTPServerDirectories(util.GetUnittestDataDir())
@@ -46,6 +66,27 @@ class TabTest(tab_test_case.TabTestCase):
     util.WaitFor(lambda: _IsDocumentVisible(self._tab), timeout=5)
     self.assertFalse(_IsDocumentVisible(new_tab))
 
+  def testIsTimelineRecordingRunningTab(self):
+    self.assertFalse(self._tab.is_timeline_recording_running)
+    self._tab.StartTimelineRecording()
+    self.assertTrue(self._tab.is_timeline_recording_running)
+    self._tab.StopTimelineRecording()
+    self.assertFalse(self._tab.is_timeline_recording_running)
+
+  #pylint: disable=W0212
+  def testIsVideoCaptureRunning(self):
+    original_platform = self._tab.browser._platform
+    self._tab.browser._platform = FakePlatform()
+    self.assertFalse(self._tab.is_video_capture_running)
+    self._tab.StartVideoCapture(min_bitrate_mbps=2)
+    self.assertTrue(self._tab.is_video_capture_running)
+    try:
+      self._tab.StopVideoCapture().next()
+    except Exception:
+      pass
+    self.assertFalse(self._tab.is_video_capture_running)
+    self._tab.browser._platform = original_platform
+
 
 class GpuTabTest(tab_test_case.TabTestCase):
   def setUp(self):