[Android] Prepare build/android/ for catapult+devil.

build/android/devil_chromium.py

 # Copyright 2015 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.
 
 """Configures devil for use in chromium."""
 
 import os
+import sys
+
+from pylib.constants import host_paths
+
+if host_paths.DEVIL_PATH not in sys.path:
+  sys.path.append(host_paths.DEVIL_PATH)
 
 from devil import devil_env
 
-
 _DEVIL_CONFIG = os.path.abspath(
     os.path.join(os.path.dirname(__file__), 'devil_chromium.json'))
 
 _DEVIL_BUILD_PRODUCT_DEPS = {
   'forwarder_device': [
     {
       'platform': 'android',
       'arch': 'armeabi-v7a',
       'name': 'forwarder_dist',
     },
@@ skipping 97 matching lines @@
           },
           ...
         }
   """
 
   devil_dynamic_config = {
     'config_type': 'BaseConfig',
     'dependencies': {},
   }
   if output_directory:
+    output_directory = os.path.abspath(output_directory)
     devil_dynamic_config['dependencies'] = {
       dep_name: {
         'file_info': {
           '%s_%s' % (dep_config['platform'], dep_config['arch']): {
             'local_paths': [
               os.path.join(output_directory, dep_config['name']),
             ],
           }
           for dep_config in dep_configs
         }
       }
       for dep_name, dep_configs in _DEVIL_BUILD_PRODUCT_DEPS.iteritems()
     }
   if custom_deps:
     devil_dynamic_config['dependencies'].update(custom_deps)
 
   devil_env.config.Initialize(
       configs=[devil_dynamic_config], config_files=[_DEVIL_CONFIG])