Telemetry: start the activity in order to initialize the prefs file.

Telemetry: start the activity in order to initialize the prefs file.

When running on a fresh install, there's no preferences available.
Rather than throwing an exception, start the browser and wait for the file to become available.

BUG=166176
TEST=tools/perf/run_multipage_benchmarks --browser=android-chrome --show-stdout sunspider tools/perf/page_sets/sunspider.json -vvv

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=175515

[tonyg, 2012-12-14 17:38:17]

lgtm

Thanks, I bumped into this the other day.

[commit-bot: I haz the power, 2012-12-14 17:42:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/1

[nduca, 2012-12-14 20:00:19]

parenthetically, awesome idea!

[commit-bot: I haz the power, 2012-12-14 22:10:39]

Retried try job too often on win_rel for step(s) browser_tests

[commit-bot: I haz the power, 2013-01-07 11:49:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/15002

[commit-bot: I haz the power, 2013-01-07 12:02:44]

Retried try job too often on ios_dbg_simulator for step(s) sync_unit_tests,
unit_tests

[commit-bot: I haz the power, 2013-01-07 14:02:23]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/15002

[commit-bot: I haz the power, 2013-01-07 14:16:35]

Retried try job too often on ios_dbg_simulator for step(s) sync_unit_tests,
unit_tests

[commit-bot: I haz the power, 2013-01-07 16:19:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/15002

[commit-bot: I haz the power, 2013-01-07 16:24:18]

Step "update" is always a major failure.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-01-07 18:42:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/15002

[commit-bot: I haz the power, 2013-01-07 18:42:10]

Failed to apply patch for tools/telemetry/telemetry/android_browser_backend.py:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file tools/telemetry/telemetry/android_browser_backend.py
  Hunk #1 FAILED at 1.
  Hunk #2 succeeded at 72 (offset 1 line).
  1 out of 2 hunks FAILED -- saving rejects to file
tools/telemetry/telemetry/android_browser_backend.py.rej

Patch:       tools/telemetry/telemetry/android_browser_backend.py
Index: tools/telemetry/telemetry/android_browser_backend.py
diff --git a/tools/telemetry/telemetry/android_browser_backend.py
b/tools/telemetry/telemetry/android_browser_backend.py
index
04e8f1ceb291cb333c32408e59139e0851bb0a7d..5d54368ab476dc7816df0aaee5f080266ce3ba64
100644
--- a/tools/telemetry/telemetry/android_browser_backend.py
+++ b/tools/telemetry/telemetry/android_browser_backend.py
@@ -1,11 +1,13 @@
 # Copyright (c) 2012 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 subprocess
 import tempfile
+import time
 
 from telemetry import adb_commands
 from telemetry import browser_backend
@@ -71,11 +73,23 @@ class AndroidBrowserBackend(browser_backend.BrowserBackend):
       prefs_file = (app_data_dir +
                     '/app_chrome/Default/Preferences')
       if not self._adb.FileExistsOnDevice(prefs_file):
-        logging.critical(
-            'android_browser_backend: Could not find preferences file ' +
-            '%s for %s' % (prefs_file, self._package))
-        raise browser_gone_exception.BrowserGoneException(
-          'Missing preferences file.')
+        # Start it up the first time so we can tweak the prefs.
+        self._adb.StartActivity(self._package,
+                                self._activity,
+                                True,
+                                None,
+                                None)
+        retries = 0
+        while not self._adb.Adb().GetFileContents(prefs_file):
+          time.sleep(3)
+          retries += 1
+          if retries == 3:
+            logging.critical('android_browser_backend: Could not find '
+                             'preferences file %s for %s',
+                             prefs_file, self._package)
+            raise browser_gone_exception.BrowserGoneException(
+                'Missing preferences file.')
+        self._adb.KillAll(self._package)
 
       with tempfile.NamedTemporaryFile() as raw_f:
         self._adb.Pull(prefs_file, raw_f.name)

[commit-bot: I haz the power, 2013-01-07 19:47:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/18005

[commit-bot: I haz the power, 2013-01-07 21:50:49]

Retried try job too often on win_aura for step(s) interactive_ui_tests

[commit-bot: I haz the power, 2013-01-08 09:54:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/11574039/18005

[commit-bot: I haz the power, 2013-01-08 10:53:23]

Change committed as 175515