Separate root and document management.

Two hidden intents for managing roots and documents, used to support
Downloads UI.  Touching an item tries launching as MANAGE_DOCUMENT
first before falling back to VIEW.  Provide MIME type for roots.

Bug: 10446265, 10531347, 10599641
Change-Id: Ia5584bd6ce3e5a9b0048e8caf1447e3053664413
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 45e2650..4c91bd3 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -30,11 +30,10 @@
                 <category android:name="android.intent.category.OPENABLE" />
                 <data android:mimeType="*/*" />
             </intent-filter>
-            <!-- data expected to point at existing root to manage -->
             <intent-filter>
-                <action android:name="android.provider.action.MANAGE_DOCUMENTS" />
+                <action android:name="android.provider.action.MANAGE_ROOT" />
                 <category android:name="android.intent.category.DEFAULT" />
-                <data android:mimeType="vnd.android.document/directory" />
+                <data android:mimeType="vnd.android.document/root" />
             </intent-filter>
         </activity>