sandwich: Implement SandwichTaskBuilder

tools/android/loading/sandwich_runner.py

 # Copyright 2016 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 json
 import logging
 import os
 import shutil
 import sys
 import tempfile
 
 _SRC_DIR = os.path.abspath(os.path.join(
     os.path.dirname(__file__), '..', '..', '..'))
 
 sys.path.append(os.path.join(_SRC_DIR, 'third_party', 'catapult', 'devil'))
 from devil.android import device_utils
 
 import chrome_cache
 import controller
 import devtools_monitor
 import device_setup
 import loading_trace
-import sandwich_metrics
 
 
+# Standard filenames in the sandwich runner's output directory.
+TRACE_FILENAME = 'trace.json'
+VIDEO_FILENAME = 'video.mp4'
+
+# List of selected trace event categories when running chrome.
+ADDITIONAL_CATEGORIES = (
+    'disabled-by-default-memory-infra',)  # Used by _GetBrowserDumpEvents()
+
 _JOB_SEARCH_PATH = 'sandwich_jobs'
 
 # Devtools timeout of 1 minute to avoid websocket timeout on slow
 # network condition.
 _DEVTOOLS_TIMEOUT = 60
 
 
 def _ReadUrlsFromJobDescription(job_name):
   """Retrieves the list of URLs associated with the job name."""
   try:
@@ skipping 154 matching lines @@
         os.makedirs(run_path)
     self._chrome_ctl.SetNetworkEmulation(
         self._GetEmulatorNetworkCondition('browser'))
     # TODO(gabadie): add a way to avoid recording a trace.
     with self._chrome_ctl.Open() as connection:
       if clear_cache:
         connection.ClearCache()
       if run_path is not None and self.record_video:
         device = self._chrome_ctl.GetDevice()
         assert device, 'Can only record video on a remote device.'
-        video_recording_path = os.path.join(run_path, 'video.mp4')
+        video_recording_path = os.path.join(run_path, VIDEO_FILENAME)
         with device_setup.RemoteSpeedIndexRecorder(device, connection,
                                                    video_recording_path):
           trace = loading_trace.LoadingTrace.RecordUrlNavigation(
               url=url,
               connection=connection,
               chrome_metadata=self._chrome_ctl.ChromeMetadata(),
-              additional_categories=sandwich_metrics.ADDITIONAL_CATEGORIES,
+              additional_categories=ADDITIONAL_CATEGORIES,
               timeout_seconds=_DEVTOOLS_TIMEOUT)
       else:
         trace = loading_trace.LoadingTrace.RecordUrlNavigation(
             url=url,
             connection=connection,
             chrome_metadata=self._chrome_ctl.ChromeMetadata(),
-            additional_categories=sandwich_metrics.ADDITIONAL_CATEGORIES,
+            additional_categories=ADDITIONAL_CATEGORIES,
             timeout_seconds=_DEVTOOLS_TIMEOUT)
     if run_path is not None:
-      trace_path = os.path.join(run_path, 'trace.json')
+      trace_path = os.path.join(run_path, TRACE_FILENAME)
       trace.ToJsonFile(trace_path)
 
   def _RunUrl(self, url, run_id):
     clear_cache = False
     if self.cache_operation == 'clear':
       clear_cache = True
     elif self.cache_operation == 'push':
       self._chrome_ctl.PushBrowserCache(self._local_cache_directory_path)
     elif self.cache_operation == 'reload':
       self._RunNavigation(url, clear_cache=True)
@@ skipping 43 matching lines @@
 
     if self._local_cache_directory_path:
       shutil.rmtree(self._local_cache_directory_path)
       self._local_cache_directory_path = None
     if self.cache_operation == 'save':
       self._PullCacheFromDevice()
     if self.trace_output_directory:
       self._SaveRunInfos(ran_urls)
 
     self._chrome_ctl = None