Add ability to skip dependency checks and uploads for particular branches.

After this CL is in users will be able to skip dependency checks and uploads for specific branches locally by running (using test2 as a branch name):
git config branch.test2.skip-deps-uploads True
To undo the skipping:
git config --unset branch.test2.skip-deps-uploads

To do the above commands globally (across all checkouts):
git config --global branch.test2.skip-deps-uploads True
git config --global --unset branch.test2.skip-deps-uploads


BUG=chromium:504832

Review URL: https://codereview.chromium.org/1210903005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295953 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -554,6 +554,11 @@ class Settings(object):
   def GetBugPrefix(self):
     return self._GetRietveldConfig('bug-prefix', error_ok=True)
 
+  def GetIsSkipDependencyUpload(self, branch_name):
+    """Returns true if specified branch should skip dep uploads."""
+    return self._GetBranchConfig(branch_name, 'skip-deps-uploads',
+                                 error_ok=True)
+
   def GetRunPostUploadHook(self):
     run_post_upload_hook = self._GetRietveldConfig(
         'run-post-upload-hook', error_ok=True)
@@ -605,6 +610,9 @@ class Settings(object):
   def _GetRietveldConfig(self, param, **kwargs):
     return self._GetConfig('rietveld.' + param, **kwargs)
 
+  def _GetBranchConfig(self, branch_name, param, **kwargs):
+    return self._GetConfig('branch.' + branch_name + '.' + param, **kwargs)
+
   def _GetConfig(self, param, **kwargs):
     self.LazyUpdateIfNeeded()
     return RunGit(['config', param], **kwargs).strip()
@@ -2191,21 +2199,27 @@ def RietveldUpload(options, args, cl, change):
     if remote is '.':
       # A local branch is being tracked.
       local_branch = ShortBranchName(upstream_branch)
-      auth_config = auth.extract_auth_config_from_options(options)
-      branch_cl = Changelist(branchref=local_branch, auth_config=auth_config)
-      branch_cl_issue_url = branch_cl.GetIssueURL()
-      branch_cl_issue = branch_cl.GetIssue()
-      branch_cl_patchset = branch_cl.GetPatchset()
-      if branch_cl_issue_url and branch_cl_issue and branch_cl_patchset:
-        upload_args.extend(
-            ['--depends_on_patchset', '%s:%s' % (
-                 branch_cl_issue, branch_cl_patchset)])
+      if settings.GetIsSkipDependencyUpload(local_branch):
         print
-        print ('The current branch (%s) is tracking a local branch (%s) with '
-               'an associated CL.') % (cl.GetBranch(), local_branch)
-        print 'Adding %s/#ps%s as a dependency patchset.' % (
-            branch_cl_issue_url, branch_cl_patchset)
+        print ('Skipping dependency patchset upload because git config '
+               'branch.%s.skip-deps-uploads is set to True.' % local_branch)
         print
+      else:
+        auth_config = auth.extract_auth_config_from_options(options)
+        branch_cl = Changelist(branchref=local_branch, auth_config=auth_config)
+        branch_cl_issue_url = branch_cl.GetIssueURL()
+        branch_cl_issue = branch_cl.GetIssue()
+        branch_cl_patchset = branch_cl.GetPatchset()
+        if branch_cl_issue_url and branch_cl_issue and branch_cl_patchset:
+          upload_args.extend(
+              ['--depends_on_patchset', '%s:%s' % (
+                   branch_cl_issue, branch_cl_patchset)])
+          print
+          print ('The current branch (%s) is tracking a local branch (%s) with '
+                 'an associated CL.') % (cl.GetBranch(), local_branch)
+          print 'Adding %s/#ps%s as a dependency patchset.' % (
+              branch_cl_issue_url, branch_cl_patchset)
+          print
 
   project = settings.GetProject()
   if project:
@@ -2256,7 +2270,14 @@ def cleanup_list(l):
 
 @subcommand.usage('[args to "git diff"]')
 def CMDupload(parser, args):
-  """Uploads the current changelist to codereview."""
+  """Uploads the current changelist to codereview.
+
+  Can skip dependency patchset uploads for a branch by running:
+    git config branch.branch_name.skip-deps-uploads True
+  To unset run:
+    git config --unset branch.branch_name.skip-deps-uploads
+  Can also set the above globally by using the --global flag.
+  """
   parser.add_option('--bypass-hooks', action='store_true', dest='bypass_hooks',
                     help='bypass upload presubmit hook')
   parser.add_option('--bypass-watchlists', action='store_true',