[android] Adds constants.GetOutDirectory() and converts test scripts to use it.

build/android/pylib/constants.py

Index: build/android/pylib/constants.py
diff --git a/build/android/pylib/constants.py b/build/android/pylib/constants.py
index 15aebaba5e011b88742de9b7f6d436caa922a605..46f9e18354f37fab7576a336ea9de312dd6e5f88 100644
--- a/build/android/pylib/constants.py
+++ b/build/android/pylib/constants.py
@@ -132,6 +132,18 @@ def SetBuildType(build_type):
   os.environ['BUILDTYPE'] = build_type
 
 
+def GetOutDirectory(build_type=None):
+  """Returns the out directory where the output binaries are built.
+
+  Args:
+    build_type: Build type, generally 'Debug' or 'Release'. Defaults to the
+      globally set build type environment variable BUILDTYPE.
+  """
+  return os.path.abspath(os.path.join(
+      DIR_SOURCE_ROOT, os.environ.get('CHROMIUM_OUT_DIR', 'out'),
+      GetBuildType() if build_type is None else build_type))
+
+
 def _GetADBPath():
   if os.environ.get('ANDROID_SDK_ROOT'):
     return 'adb'