[Telemetry] Reorganize everything.

tools/perf/perf_tools/memory_benchmark_unittest.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.
-from telemetry import multi_page_benchmark_unittest_base
 from perf_tools import memory_benchmark
+from telemetry.page import multi_page_benchmark_unittest_base
 
 class MemoryBenchmarkUnitTest(
   multi_page_benchmark_unittest_base.MultiPageBenchmarkUnitTestBase):
 
   def testMemoryBenchmark(self):
     ps = self.CreatePageSetFromFileInUnittestDataDir('page_with_link.html')
     ps.pages[0].stress_memory = {'action': 'click_element_action',
                                  'text': 'Click me'}
 
     benchmark = memory_benchmark.MemoryBenchmark()
     all_results = self.RunBenchmark(benchmark, ps)
 
     self.assertEqual(0, len(all_results.page_failures))
     self.assertEqual(1, len(all_results.page_results))
 
     results0 = all_results.page_results[0]
     expected_measurements = ['V8_MemoryExternalFragmentationTotal',
                              'V8_MemoryHeapSampleTotalCommitted',
                              'V8_MemoryHeapSampleTotalUsed']
 
     self.assertTrue(all(
         [m in results0.measurement_names for m in expected_measurements]))