Add infrastructure to run tests on android.

mojo/tools/mopy/transitive_hash.py

Index: mojo/tools/mopy/transitive_hash.py
diff --git a/mojo/tools/mopy/transitive_hash.py b/mojo/tools/mopy/transitive_hash.py
index 48b6a60b21898fafd36a8c5a7bd41ef18168a3fb..c7c237528fcbe119cf0315fde72b8e203d125c53 100644
--- a/mojo/tools/mopy/transitive_hash.py
+++ b/mojo/tools/mopy/transitive_hash.py
@@ -29,17 +29,17 @@ def _memoize(f):
   return Memoize().__getitem__
 
 @_memoize
-def _file_hash(filename):
-  """Returns a string representing the hash of the given file."""
-  _logging.debug("Hashing %s ...", filename)
-  with open(filename, mode='rb') as f:
-    m = hashlib.sha256()
-    while True:
-      block = f.read(4096)
-      if not block:
-        break
-      m.update(block)
-  _logging.debug("  => %s", m.hexdigest())
+def _file_hash(filename):
+  """Returns a string representing the hash of the given file."""
+  _logging.debug("Hashing %s ...", filename)
+  with open(filename, mode='rb') as f:
+    m = hashlib.sha256()
+    while True:
+      block = f.read(4096)
+      if not block:
+        break
+      m.update(block)
+  _logging.debug("  => %s", m.hexdigest())
   return m.hexdigest()
 
 @_memoize
@@ -61,7 +61,7 @@ def _get_dependencies(filename):
   _logging.debug("  => %s", rv)
   return rv
 
-def transitive_hash(filename):
+def transitive_hash(filename, transitive=True):
   """Returns a string that represents the "transitive" hash of the given
   file. The transitive hash is a hash of the file and all the shared libraries
   on which it depends (done in an order-independent way)."""
@@ -75,7 +75,8 @@ def transitive_hash(filename):
       continue
     _logging.debug("Haven't seen %s (%s) ...", current_filename, current_hash)
     hashes.add(current_hash)
-    to_hash.extend(_get_dependencies(current_filename))
+    if transitive:
+      to_hash.extend(_get_dependencies(current_filename))
   return sha256('|'.join(sorted(hashes))).hexdigest()
 
 def main(argv):