Pass mb_mastername and mb_buildername as parameters to override the default.

scripts/slave/recipes/android_webview_aosp.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 DEPS = [
   'android',
   'chromium_android',
   'filter',
   'json',
   'path',
@@ skipping 56 matching lines @@
   # build the parts of Chromium that are needed by the WebView.
   droid.gyp_webview_step()
 
   # This check is in place to detect incompatibly-licensed new code that's
   # checked into the main Chromium repository.
   droid.all_incompatible_directories_check_step()
 
   # Early out if we haven't changed any relevant code.
   api.filter.does_patch_require_compile(
       api.tryserver.get_files_affected_by_patch(),
+      api.properties['mastername'],
+      api.properties['buildername'],
       additional_compile_targets=WEBVIEW_EXES,
       additional_names=['android_webview'])
   if api.tryserver.is_tryserver and not api.filter.compile_targets:
     return
 
   # If the Manifest has changed then we need to recompile everything.
   force_clobber = AOSP_MANIFEST_PATH in api.filter.paths
 
   # TODO(android): use api.chromium.compile for this
   droid.compile_step(
@@ skipping 97 matching lines @@
     api.properties.tryserver() +
     chrome_change
   )
 
   yield (
     api.test('use_v8_patch_on_webview_trybot') +
     api.properties.tryserver() +
     api.properties(patch_project='v8') +
     dependant_change
   )