[telemetry] Move telemetry/core/chrome/ to telemetry/core/backends/chrome/

tools/perf/metrics/smoothness_unittest.py

 # 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 unittest
 import random
 
 from metrics import smoothness
 from metrics.gpu_rendering_stats import GpuRenderingStats
 from telemetry.page import page
 from telemetry.page.page_measurement_results import PageMeasurementResults
-from telemetry.core.chrome.tracing_backend import RawTraceResultImpl
-from telemetry.core.chrome.trace_result import TraceResult
+from telemetry.core.backends.chrome.tracing_backend import RawTraceResultImpl
+from telemetry.core.backends.chrome.trace_result import TraceResult
 
 class MockTimer(object):
   """ An instance of this class is used as a global timer to generate
       random durations for stats and consistent timestamps for all mock trace
       events.
   """
   def __init__(self):
     self.microseconds = 0
 
   def Advance(self, low = 0, high = 100000):
@@ skipping 276 matching lines @@
     self.assertAlmostEquals(
         round(rs['totalTouchUILatency'] / rs['touchUICount'] * 1000.0, 3),
         res.page_results[0]['average_touch_ui_latency'].value)
     self.assertAlmostEquals(
         round(rs['totalTouchAckedLatency'] / rs['touchAckedCount'] * 1000.0, 3),
         res.page_results[0]['average_touch_acked_latency'].value)
     self.assertAlmostEquals(
         round(rs['totalScrollUpdateLatency'] / rs['scrollUpdateCount'] * 1000.0,
               3),
         res.page_results[0]['average_scroll_update_latency'].value)