Revert of Comment out applying patchset dependencies in apply_issue.py (patchset #2 id:20001 of https://codereview.chromium.org/1194063003/)

Reason for revert:
https://chromereviews.googleplex.com/221697013/ has landed. Re-enable applying patchset dependencies in apply_issue.py

Original issue's description:
> Comment out applying patchset dependencies in apply_issue.py
> 
> Context is in the internal chrome-infra thread here:
> https://groups.google.com/a/google.com/d/msg/chrome-infra/dNQGjNoP-Dg/XDymPAwOCXkJ
> 
> NOPRESUBMIT=true
> 
> BUG=chromium:480453
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=295800

TBR=phajdan.jr@chromium.org
BUG=chromium:480453

Review URL: https://codereview.chromium.org/1237703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@296016 0039d316-1c4b-4281-b951-d872f2087c98

apply_issue.py

@@ -167,27 +167,22 @@ def main():
     print('No patchset specified. Using patchset %d' % options.patchset)
 
   issues_patchsets_to_apply = [(options.issue, options.patchset)]
-
-  # Temporary comment out the below while we try to figure out what to do with
-  # patchset dependencies on trybots.
-  # TODO(rmistry): Uncomment the below after a solution is found.
-  # depends_on_info = obj.get_depends_on_patchset(options.issue,
-  #                                               options.patchset)
-  # while depends_on_info:
-  #   depends_on_issue = int(depends_on_info['issue'])
-  #   depends_on_patchset = int(depends_on_info['patchset'])
-  #   try:
-  #     depends_on_info = obj.get_depends_on_patchset(depends_on_issue,
-  #                                                   depends_on_patchset)
-  #     issues_patchsets_to_apply.insert(0, (depends_on_issue,
-  #                                          depends_on_patchset))
-  #   except urllib2.HTTPError:
-  #     print ('The patchset that was marked as a dependency no longer '
-  #            'exists: %s/%d/#ps%d' % (
-  #                options.server, depends_on_issue, depends_on_patchset))
-  #     print 'Therefore it is likely that this patch will not apply cleanly.'
-  #     print
-  #     depends_on_info = None
+  depends_on_info = obj.get_depends_on_patchset(options.issue, options.patchset)
+  while depends_on_info:
+    depends_on_issue = int(depends_on_info['issue'])
+    depends_on_patchset = int(depends_on_info['patchset'])
+    try:
+      depends_on_info = obj.get_depends_on_patchset(depends_on_issue,
+                                                    depends_on_patchset)
+      issues_patchsets_to_apply.insert(0, (depends_on_issue,
+                                           depends_on_patchset))
+    except urllib2.HTTPError:
+      print ('The patchset that was marked as a dependency no longer '
+             'exists: %s/%d/#ps%d' % (
+                 options.server, depends_on_issue, depends_on_patchset))
+      print 'Therefore it is likely that this patch will not apply cleanly.'
+      print
+      depends_on_info = None
 
   num_issues_patchsets_to_apply = len(issues_patchsets_to_apply)
   if num_issues_patchsets_to_apply > 1: