Enable some profile_chrome unit tests on Trybots

systrace/profile_chrome/util.py

 # Copyright 2014 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 gzip
 import os
 import time
 import zipfile
 
+from devil.android.sdk import intent
+from devil.android.sdk import keyevent
+
 
 def ArchiveFiles(host_files, output):
   with zipfile.ZipFile(output, 'w', zipfile.ZIP_DEFLATED) as z:
     for host_file in host_files:
       z.write(host_file)
       os.unlink(host_file)
 
 def CompressFile(host_file, output):
   with gzip.open(output, 'wb') as out, open(host_file, 'rb') as input_file:
     out.write(input_file.read())
   os.unlink(host_file)
 
 def ArchiveData(trace_results, output):
   with zipfile.ZipFile(output, 'w', zipfile.ZIP_DEFLATED) as z:
     for result in trace_results:
       trace_file = result.source_name + GetTraceTimestamp()
       WriteDataToCompressedFile(result.raw_data, trace_file)
       z.write(trace_file)
       os.unlink(trace_file)
 
 def WriteDataToCompressedFile(data, output):
   with gzip.open(output, 'wb') as out:
     out.write(data)
 
 def GetTraceTimestamp():
   return time.strftime('%Y-%m-%d-%H%M%S', time.localtime())
+
+def StartBrowser(device, package_info):

[Sami, 2016/09/09 10:28:25]

Feels like this fits in better in the test harness. Except for the startup test,
I don't think we'd need to start the browser automatically in any other case.

[washingtonp, 2016/09/09 18:07:29]

Done.

+  # Turn on the device screen.
+  device.SetScreen(True)
+
+  # Unlock device.
+  device.SendKeyEvent(keyevent.KEYCODE_MENU)
+
+  # Start browser.
+  device.StartActivity(
+    intent.Intent(activity=package_info.activity,
+                  package=package_info.package,
+                  data='about:blank',
+                  extras={'create_new_tab': True}),
+    blocking=True, force_stop=True)
+
+def GetChromeProcessID(device, package_info):
+  chrome_processes = device.GetPids(package_info.package)
+  if (package_info.package in chrome_processes and
+      len(chrome_processes[package_info.package]) > 0):
+    return chrome_processes[package_info.package][0]
+  return None