depot_tools: add master_deps in gclient/config.py

recipe_modules/gclient/config.py

Index: recipe_modules/gclient/config.py
diff --git a/recipe_modules/gclient/config.py b/recipe_modules/gclient/config.py
index 0bcba6c178a60e0503c8d99cdbfc08a76cb46daf..b8152734b11bf7d14fdc6d71af65103a2719b4d7 100644
--- a/recipe_modules/gclient/config.py
+++ b/recipe_modules/gclient/config.py
@@ -421,6 +421,14 @@ def build_internal_scripts_slave(c):
   c.got_revision_mapping['build'] = 'got_build_revision'
 
 @config_ctx()
+def master_deps(c):
+  s = c.solutions.add()
+  s.name = 'build_internal/master.DEPS'
+  s.url = ('https://chrome-internal.googlesource.com/'
+           'chrome/tools/build/master.DEPS.git')
+  c.got_revision_mapping['build_internal/master.DEPS'] = 'got_revision'
+
+@config_ctx()
 def slave_deps(c):
   s = c.solutions.add()
   s.name = 'build_internal/slave.DEPS'