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

build/android/gyp/util/build_utils.py

Index: build/android/gyp/util/build_utils.py
diff --git a/build/android/gyp/util/build_utils.py b/build/android/gyp/util/build_utils.py
index 10c7ba2b87f821e4f028e9edad39617fc7c1c437..fe69c956f0f9f49db1ceb4e085c84668e1c7a5fc 100644
--- a/build/android/gyp/util/build_utils.py
+++ b/build/android/gyp/util/build_utils.py
@@ -20,9 +20,9 @@ import zipfile
 import md5_check  # pylint: disable=relative-import
 
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
-from pylib import constants
+from pylib.constants import host_paths
 
-COLORAMA_ROOT = os.path.join(constants.DIR_SOURCE_ROOT,
+COLORAMA_ROOT = os.path.join(host_paths.DIR_SOURCE_ROOT,
                              'third_party', 'colorama', 'src')
 # aapt should ignore OWNERS files in addition the default ignore pattern.
 AAPT_IGNORE_PATTERN = ('!OWNERS:!.svn:!.git:!.ds_store:!*.scc:.*:<dir>_*:' +
@@ -369,9 +369,9 @@ def GetPythonDependencies():
 
   abs_module_paths = map(os.path.abspath, module_paths)
 
-  assert os.path.isabs(constants.DIR_SOURCE_ROOT)
+  assert os.path.isabs(host_paths.DIR_SOURCE_ROOT)
   non_system_module_paths = [
-      p for p in abs_module_paths if p.startswith(constants.DIR_SOURCE_ROOT)]
+      p for p in abs_module_paths if p.startswith(host_paths.DIR_SOURCE_ROOT)]
   def ConvertPycToPy(s):
     if s.endswith('.pyc'):
       return s[:-1]