[telemetry] Install PushAppsToBackground apk

telemetry/telemetry/testing/fakes/__init__.py

Index: telemetry/telemetry/testing/fakes/__init__.py
diff --git a/telemetry/telemetry/testing/fakes/__init__.py b/telemetry/telemetry/testing/fakes/__init__.py
index 38d70dbaf0f72812a6f60d2f6777c1feaf36e75e..2dc5f44ce360c6ff6f043cac61596e29e32f558e 100644
--- a/telemetry/telemetry/testing/fakes/__init__.py
+++ b/telemetry/telemetry/testing/fakes/__init__.py
@@ -42,6 +42,9 @@ class FakePlatform(object):
       self._tracing_controller = _FakeTracingController()
     return  self._tracing_controller
 
+  def Initialize(self):
+    pass
+
   def CanMonitorThermalThrottling(self):
     return False