Change structure of deps file and tool for adding chromium dep.

Change structure of chromium owned dependencies file to JSON to
simplify work with it in different tools. Also add tool to check in
new chromium owned dep with single command like this:
./tools_webrtc/autoroller/checkin_chromium_dep.py -d <dep name>

Introduce separate file with list of webrtc owned dependencies.



Bug: webrtc:8366
Change-Id: I30a828af34cd105ce7e6bc76d6b5889e6bf7574d
Reviewed-on: https://webrtc-review.googlesource.com/76840
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23270}

tools_webrtc/autoroller/roll_deps.py

@@ -12,6 +12,7 @@
 import argparse
 import base64
 import collections
+import json
 import logging
 import os
 import re
@@ -414,12 +415,9 @@ def UpdateDepsFile(deps_filename, rev_update, changed_deps):
 
 
 def _LoadThirdPartyDepsAndFiles(filename):
-  third_party_deps = {}
   with open(filename, 'rb') as f:
-    deps_content = f.read()
-    global_scope = {}
-    exec (deps_content, global_scope, third_party_deps)
-  return third_party_deps.get('DEPS', [])
+    data = json.load(f)
+    return data.get('dependencies', [])
 
 
 def UpdateThirdPartyDeps(new_rev, dest_dir, source_dir,
@@ -613,10 +611,12 @@ def main():
   logging.debug('Commit message:\n%s', commit_msg)
 
   _CreateRollBranch(opts.dry_run)
+  third_party_chromium_deps_list = os.path.join(
+      CHECKOUT_SRC_DIR, 'THIRD_PARTY_CHROMIUM_DEPS.json')
   UpdateThirdPartyDeps(rev_update.new_third_party_rev,
                        os.path.join(CHECKOUT_SRC_DIR, 'third_party'),
                        cr_3p_repo,
-                       os.path.join(CHECKOUT_SRC_DIR, 'THIRD_PARTY_DEPS'))
+                       third_party_chromium_deps_list)
   UpdateDepsFile(deps_filename, rev_update, changed_deps)
   if _IsTreeClean():
     logging.info("No DEPS changes detected, skipping CL creation.")