Merge "Make extract_package() work for toplevel classes."

am: c9c54798f6

Change-Id: Ib97e34604f4284e770d375eb4666303e0234c245

tools/hiddenapi/generate_hiddenapi_lists.py

@@ -149,7 +149,12 @@ def extract_package(signature):
         The package name of the class containing the field/method.
     """
     full_class_name = signature.split(";->")[0]
-    package_name = full_class_name[1:full_class_name.rindex("/")]
+    # Example: Landroid/hardware/radio/V1_2/IRadio$Proxy
+    if (full_class_name[0] != "L"):
+        raise ValueError("Expected to start with 'L': %s" % full_class_name)
+    full_class_name = full_class_name[1:]
+    # If full_class_name doesn't contain '/', then package_name will be ''.
+    package_name = full_class_name.rpartition("/")[0]
     return package_name.replace('/', '.')
 
 class FlagsDict: