Refactor BenchmarkResult.Add to take enum for data_type

tools/telemetry/telemetry/core/platform/android_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/android_platform_backend.py
===================================================================
--- tools/telemetry/telemetry/core/platform/android_platform_backend.py	(revision 222891)
+++ tools/telemetry/telemetry/core/platform/android_platform_backend.py	(working copy)
@@ -11,7 +11,8 @@
 
 # Get build/android scripts into our path.
 util.AddDirToPythonPath(util.GetChromiumSrcDir(), 'build', 'android')
-from pylib import perf_tests_helper  # pylint: disable=F0401
+util.AddDirToPythonPath(util.GetChromiumSrcDir(), 'build', 'util', 'lib')
+from common import perf_tests_results_helper  # pylint: disable=F0401
 from pylib import thermal_throttle  # pylint: disable=F0401
 
 try:
@@ -25,7 +26,7 @@
     super(AndroidPlatformBackend, self).__init__()
     self._adb = adb
     self._surface_stats_collector = None
-    self._perf_tests_setup = perf_tests_helper.PerfControl(self._adb)
+    self._perf_tests_setup = perf_tests_results_helper.PerfControl(self._adb)
     self._thermal_throttle = thermal_throttle.ThermalThrottle(self._adb)
     self._no_performance_mode = no_performance_mode
     self._raw_display_frame_rate_measurements = []
@@ -139,7 +140,7 @@
     return False
 
   def FlushEntireSystemCache(self):
-    cache_control = perf_tests_helper.CacheControl(self._adb)
+    cache_control = perf_tests_results_helper.CacheControl(self._adb)
     cache_control.DropRamCaches()
 
   def FlushSystemCacheForDirectory(self, directory, ignoring=None):