[android] Make build_type a singleton.

build/android/pylib/gtest/test_package_apk.py

Index: build/android/pylib/gtest/test_package_apk.py
diff --git a/build/android/pylib/gtest/test_package_apk.py b/build/android/pylib/gtest/test_package_apk.py
index 84dd7bd8e746f0396e0ed49e9e9ded64fad081a5..80d1dea5a269465cf66fa4dbff4d03887f918c1d 100644
--- a/build/android/pylib/gtest/test_package_apk.py
+++ b/build/android/pylib/gtest/test_package_apk.py
@@ -23,14 +23,14 @@ from test_package import TestPackage
 class TestPackageApk(TestPackage):
   """A helper class for running APK-based native tests."""
 
-  def __init__(self, suite_name, build_type):
+  def __init__(self, suite_name):
     """
     Args:
       suite_name: Name of the test suite (e.g. base_unittests).
-      build_type: 'Release' or 'Debug'.
     """
     TestPackage.__init__(self, suite_name)
-    product_dir = os.path.join(cmd_helper.OutDirectory.get(), build_type)
+    product_dir = os.path.join(cmd_helper.OutDirectory.get(),
+        constants.GetBuildType())
     if suite_name == 'content_browsertests':
       self.suite_path = os.path.join(
           product_dir, 'apks', '%s.apk' % suite_name)