Telemetry: Implement idle wakeups counting on Android.

tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py

Index: tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py b/tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py
index d227e300d3642d50661aa7a6c9ee2e68c82a5ea4..2962b7ba8fe5d24d433db2be0019aa94d28f65f9 100644
--- a/tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py
+++ b/tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py
@@ -1,6 +1,7 @@
 # Copyright 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 logging
 import os
 import unittest
@@ -26,6 +27,9 @@ class TestBackend(linux_based_platform_backend.LinuxBasedPlatformBackend):
   def GetClockTicks(self):
     return 41
 
+  def GetIdleWakeupCount(self, pid):
+    return self._GetIdleWakeupCount(pid)
+
 
 class LinuxBasedPlatformBackendTest(unittest.TestCase):
 
@@ -33,6 +37,21 @@ class LinuxBasedPlatformBackendTest(unittest.TestCase):
     with open(os.path.join(util.GetUnittestDataDir(), real_file)) as f:
       backend.SetMockFile(mock_file, f.read())
 
+  def testGetIdleWakeupCount(self):
+    backend = TestBackend()
+    self.SetMockFileInBackend(backend, 'timer_stats_empty', '/proc/timer_stats')
+    result = backend.GetIdleWakeupCount(31735).total_sum()
+    self.assertEquals(result, 0)
+
+    self.SetMockFileInBackend(backend, 'timer_stats', '/proc/timer_stats')
+    result = backend.GetIdleWakeupCount(31735).total_sum()
+    self.assertEquals(result, 14)
+
+    self.SetMockFileInBackend(backend, 'timer_stats_dup_pid',
+                              '/proc/timer_stats')
+    result = backend.GetIdleWakeupCount(31735).total_sum()
+    self.assertEquals(result, 1303)
+
   def testGetCpuStatsBasic(self):
     if not linux_based_platform_backend.resource:
       logging.warning('Test not supported')
@@ -40,8 +59,10 @@ class LinuxBasedPlatformBackendTest(unittest.TestCase):
 
     backend = TestBackend()
     self.SetMockFileInBackend(backend, 'stat', '/proc/1/stat')
+    self.SetMockFileInBackend(backend, 'timer_stats_empty', '/proc/timer_stats')
     result = backend.GetCpuStats(1)
-    self.assertEquals(result, {'CpuProcessTime': 22.0})
+    self.assertTrue('CpuProcessTime'in result)
+    self.assertEquals(result['CpuProcessTime'], 22.0)
 
   def testGetCpuTimestampBasic(self):
     if not linux_based_platform_backend.resource: