Telemetry: extends Platform abstraction.

tools/telemetry/telemetry/core/chrome/android_platform_backend.py

+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import sys
+
+# Get build/android scripts into our path.
+sys.path.append(
+    os.path.abspath(
+        os.path.join(os.path.dirname(__file__),
+                     '../../../build/android')))
+
+from pylib import perf_tests_helper  # pylint: disable=F0401
+from pylib import thermal_throttle  # pylint: disable=F0401
+
+try:
+  from pylib import surface_stats_collector # pylint: disable=F0401
+except Exception:
+  surface_stats_collector = None
+
+
+class AndroidPlatformBackend(object):
+  def __init__(self, adb, window_package, window_activity):
+    super(AndroidPlatformBackend, self).__init__()
+    self._adb = adb
+    self._window_package = window_package
+    self._window_activity = window_activity
+    self._surface_stats_collector = None
+    self._perf_tests_setup = perf_tests_helper.PerfTestSetup(self._adb)
+    self._thermal_throttle = thermal_throttle.ThermalThrottle(self._adb)
+
+  def IsRawDisplayFrameRateSupported(self):
+    return True
+
+  def StartRawDisplayFrameRateMeasurement(self, trace_tag):
+    assert not self._surface_stats_collector
+    self._surface_stats_collector = \
+        surface_stats_collector.SurfaceStatsCollector(
+            self._adb, self._window_package, self._window_activity, trace_tag)
+    self._surface_stats_collector.__enter__()
+
+  def StopRawDisplayFrameRateMeasurement(self):
+    self._surface_stats_collector.__exit__()
+    self._surface_stats_collector = None
+
+  def SetFullPerformanceModeEnabled(self, enabled):
+    if enabled:
+      self._perf_tests_setup.SetUp()
+    else:
+      self._perf_tests_setup.TearDown()
+
+  def CanMonitorThermalThrottling(self):
+    return True
+
+  def IsThermallyThrottled(self):
+    return self._thermal_throttle.IsThrottled()
+
+  def HasBeenThermallyThrottled(self):
+    return self._thermal_throttle.HasBeenThrottled()