Add extra to ASSIST intent to indicate potential input type

This lets Now and other assistance apps know to start up expecting a
specific type of input (e.g.  keyboard).

Bug: 16355810
Change-Id: I158e416ef8310a01cb22b19fd5b6850d2429e266
diff --git a/core/java/android/content/Intent.java b/core/java/android/content/Intent.java
index 61e105b..bc17639 100644
--- a/core/java/android/content/Intent.java
+++ b/core/java/android/content/Intent.java
@@ -1213,6 +1213,13 @@
             = "android.intent.extra.ASSIST_CONTEXT";
 
     /**
+     * An optional field on {@link #ACTION_ASSIST} suggesting that the user will likely use a
+     * keyboard as the primary input device for assistance.
+     */
+    public static final String EXTRA_ASSIST_INPUT_HINT_KEYBOARD =
+            "android.intent.extra.ASSIST_INPUT_HINT_KEYBOARD";
+
+    /**
      * Activity Action: List all available applications
      * <p>Input: Nothing.
      * <p>Output: nothing.