Add a webkit-patch command which gets a list of relevant try jobs.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_from_try_jobs.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_from_try_jobs.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_from_try_jobs.py b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_from_try_jobs.py
new file mode 100644
index 0000000000000000000000000000000000000000..31c57efa84b055ced64975f5963e7defb353ec89
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+++ b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_from_try_jobs.py
@@ -0,0 +1,58 @@
+# 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.
+
+"""A command to fetch new baselines from try jobs for a Rietveld issue.
+
+This command interacts with the Rietveld API to get information about try jobs
+with layout test results.
+
+TODO(qyearsley): Finish this module. After getting a list of try bots:
+  - For each bot get the list of tests to rebaseline.
+  - Invoke webkit-patch rebaseline-test-internal to fetch the baselines.
+"""
+
+import logging
+import optparse
+
+from webkitpy.common.net.rietveld import latest_try_jobs
+from webkitpy.tool.commands.rebaseline import AbstractParallelRebaselineCommand
+from webkitpy.common.net.web import Web
+
+
+TRY_BOTS = (
+    'linux_chromium_rel_ng',
+    'mac_chromium_rel_ng',
+    'win_chromium_rel_ng',
+)
+
+_log = logging.getLogger(__name__)
+
+
+class RebaselineFromTryJobs(AbstractParallelRebaselineCommand):
+    name = "rebaseline-from-try-jobs"
+    help_text = "Fetches new baselines from layout test runs on try bots."
+    show_in_main_help = True
+
+    def __init__(self):
+        super(RebaselineFromTryJobs, self).__init__(options=[
+            optparse.make_option(
+                '--issue', type='int', default=None,
+                help="Rietveld issue number."),
+        ])
+        self.web = Web()
+
+    def execute(self, options, args, tool):
+        if not options.issue:
+            # TODO(qyearsley): Later, the default behavior will be to run
+            # git cl issue to get the issue number, then get lists of tests
+            # to rebaseline and download new baselines.
+            _log.info('No issue number provided.')
+            return
+        _log.info('Getting results for Rietveld issue %d.' % options.issue)
+        jobs = latest_try_jobs(options.issue, TRY_BOTS, self.web)
+        for job in jobs:
+            _log.info('  Builder: %s\n  Master: %s\n  Build: %d',
+                      job.builder_name,
+                      job.master_name,
+                      job.build_number)