Add WebView.removeJavascriptInterface()

Bug: 3234178
Change-Id: I7136f8d76b20f90a7e9e1c55b6755ffe6c35b77b

core/java/android/webkit/BrowserFrame.java

@@ -599,13 +599,20 @@ class BrowserFrame extends Handler {
 
     public void addJavascriptInterface(Object obj, String interfaceName) {
         assert obj != null;
+        removeJavascriptInterface(interfaceName);
         if (mJSInterfaceMap == null) {
             mJSInterfaceMap = new HashMap<String, Object>();
         }
+        mJSInterfaceMap.put(interfaceName, obj);
+    }
+
+    public void removeJavascriptInterface(String interfaceName) {
+        if (mJSInterfaceMap == null) {
+            return;
+        }
         if (mJSInterfaceMap.containsKey(interfaceName)) {
             mJSInterfaceMap.remove(interfaceName);
         }
-        mJSInterfaceMap.put(interfaceName, obj);
     }
 
     /**

core/java/android/webkit/WebView.java

@@ -3523,7 +3523,8 @@ public class WebView extends AbsoluteLayout
      * </ul></p>
      * @param obj The class instance to bind to Javascript, null instances are
      *            ignored.
-     * @param interfaceName The name to used to expose the class in JavaScript.
+     * @param interfaceName The name to used to expose the instance in
+     *                      JavaScript.
      */
     public void addJavascriptInterface(Object obj, String interfaceName) {
         if (obj == null) {
@@ -3535,6 +3536,16 @@ public class WebView extends AbsoluteLayout
         mWebViewCore.sendMessage(EventHub.ADD_JS_INTERFACE, arg);
     }
 
+    /**
+     * Removes a previously added JavaScript interface with the given name.
+     * @param interfaceName The name of the interface to remove.
+     */
+    public void removeJavascriptInterface(String interfaceName) {
+        WebViewCore.JSInterfaceData arg = new WebViewCore.JSInterfaceData();
+        arg.mInterfaceName = interfaceName;
+        mWebViewCore.sendMessage(EventHub.REMOVE_JS_INTERFACE, arg);
+    }
+
     /**
      * Return the WebSettings object used to control the settings for this
      * WebView.

core/java/android/webkit/WebViewCore.java

@@ -852,6 +852,7 @@ final class WebViewCore {
             "VALID_NODE_BOUNDS", // = 146
             "SAVE_WEBARCHIVE", // = 147
             "WEBKIT_DRAW_LAYERS", // = 148;
+            "REMOVE_JS_INTERFACE", // = 149;
         };
 
     class EventHub {
@@ -925,6 +926,8 @@ final class WebViewCore {
         // Update layers
         static final int WEBKIT_DRAW_LAYERS = 148;
 
+        static final int REMOVE_JS_INTERFACE = 149;
+
         // Network-based messaging
         static final int CLEAR_SSL_PREF_TABLE = 150;
 
@@ -1290,6 +1293,12 @@ final class WebViewCore {
                                     jsData.mInterfaceName);
                             break;
 
+                        case REMOVE_JS_INTERFACE:
+                            jsData = (JSInterfaceData) msg.obj;
+                            mBrowserFrame.removeJavascriptInterface(
+                                    jsData.mInterfaceName);
+                            break;
+
                         case REQUEST_EXT_REPRESENTATION:
                             mBrowserFrame.externalRepresentation(
                                     (Message) msg.obj);