[Telemetry] Android power moniotrs extend SysfsPowerMonitor.

tools/telemetry/telemetry/core/platform/android_sysfs_platform.py

Index: tools/telemetry/telemetry/core/platform/android_sysfs_platform.py
diff --git a/tools/telemetry/telemetry/core/platform/android_sysfs_platform.py b/tools/telemetry/telemetry/core/platform/android_sysfs_platform.py
new file mode 100644
index 0000000000000000000000000000000000000000..942208739e9af5d598bfb34f89e3c4633eceb59e
--- /dev/null
+++ b/tools/telemetry/telemetry/core/platform/android_sysfs_platform.py
@@ -0,0 +1,43 @@
+# Copyright 2014 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.
+
+from telemetry.core.platform import sysfs_platform
+
+
+class AndroidSysfsPlatform(sysfs_platform.SysfsPlatform):
+  """A SysfsPlatform implementation to be used for Android devices."""
+  def __init__(self, device):
+    """Constructor.
+
+    Args:
+        device: Android device to monitor.
+    """
+    super(AndroidSysfsPlatform, self).__init__()
+    self._device = device
+
+  def RunShellCommand(self, command):
+    return '\n'.join(self._device.RunShellCommand(command))
+
+  @staticmethod
+  def ParseStateSample(sample):
+    sample_stats = {}
+    for cpu in sample:
+      values = sample[cpu].splitlines()
+      # Each state has three values after excluding the time value.
+      num_states = (len(values) - 1) / 3
+      names = values[:num_states]
+      times = values[num_states:2 * num_states]
+      cstates = {'C0': int(values[-1]) * 10 ** 6}
+      for i, state in enumerate(names):
+        if state == 'C0':
+          # The Exynos cpuidle driver for the Nexus 10 uses the name 'C0' for
+          # its WFI state.
+          # TODO(tmandel): We should verify that no other Android device
+          # actually reports time in C0 causing this to report active time as
+          # idle time.
+          state = 'WFI'
+        cstates[state] = int(times[i])
+        cstates['C0'] -= int(times[i])
+      sample_stats[cpu] = cstates
+    return sample_stats