Add comments about --config-vars that need to be in sync.

BUG=none

Review URL: https://codereview.chromium.org/1062363002

Cr-Original-Commit-Position: refs/heads/master@{#324280}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 1abe5b4643edb113d9ce3ac58c69d40967d74cc5

android/pylib/utils/isolator.py

@@ -24,6 +24,7 @@ def DefaultPathVariables():
 
 
 def DefaultConfigVariables():
+  # Note: This list must match the --config-vars in build/isolate.gypi
   return {
     'CONFIGURATION_NAME': constants.GetBuildType(),
     'OS': 'android',

isolate.gypi

@@ -61,9 +61,6 @@
         # Variables should use the -V FOO=<(FOO) form so frequent values,
         # like '0' or '1', aren't stripped out by GYP. Run 'isolate.py help' for
         # more details.
-        #
-        # This list needs to be kept in sync with the cmd line options
-        # in src/build/android/pylib/gtest/setup.py.
 
         # Path variables are used to replace file paths when loading a .isolate
         # file
@@ -74,6 +71,8 @@
         # the .isolate file but are not considered relative paths.
         '--extra-variable', 'version_full=<(version_full)',
 
+        # Note: This list must match DefaultConfigVariables()
+        # in build/android/pylib/utils/isolator.py
         '--config-variable', 'CONFIGURATION_NAME=<(CONFIGURATION_NAME)',
         '--config-variable', 'OS=<(OS)',
         '--config-variable', 'asan=<(asan)',