Bug 1570115 - Add default handler for OnLoad{Request,Error}. r=droeh

Differential Revision: https://phabricator.services.mozilla.com/D44049

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoSession.java

@@ -517,9 +517,11 @@ public class GeckoSession implements Parcelable {
             "GeckoViewNavigation", this,
             new String[]{
                 "GeckoView:LocationChange",
+                "GeckoView:OnNewSession"
+            },
+            new String[] {
                 "GeckoView:OnLoadError",
                 "GeckoView:OnLoadRequest",
-                "GeckoView:OnNewSession"
             }
         ) {
             // This needs to match nsIBrowserDOMWindow.idl
@@ -533,6 +535,20 @@ public class GeckoSession implements Parcelable {
                 }
             }
 
+            @Override
+            public void handleDefaultMessage(final String event,
+                                             final GeckoBundle message,
+                                             final EventCallback callback) {
+
+                if ("GeckoView:OnLoadRequest".equals(event)) {
+                    callback.sendSuccess(false);
+                } else if ("GeckoView:OnLoadError".equals(event)) {
+                    callback.sendSuccess(null);
+                } else {
+                    super.handleDefaultMessage(event, message, callback);
+                }
+            }
+
             @Override
             public void handleMessage(final NavigationDelegate delegate,
                                       final String event,

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoSessionHandler.java

@@ -27,10 +27,20 @@ import android.util.Log;
     /* package */ GeckoSessionHandler(final String module,
                                       final GeckoSession session,
                                       final String[] events) {
+        this(module, session, events, new String[]{});
+    }
+
+    /* package */ GeckoSessionHandler(final String module,
+                                      final GeckoSession session,
+                                      final String[] events,
+                                      final String[] defaultEvents) {
         session.handlersCount++;
 
         mModuleName = module;
         mEvents = events;
+
+        // Default events are always active
+        session.getEventDispatcher().registerUiThreadListener(this, defaultEvents);
     }
 
     public Delegate getDelegate() {
@@ -78,8 +88,8 @@ import android.util.Log;
 
         if (mDelegate != null) {
             handleMessage(mDelegate, event, message, callback);
-        } else if (callback != null) {
-            callback.sendError("No delegate registered");
+        } else {
+            handleDefaultMessage(event, message, callback);
         }
     }
 
@@ -87,4 +97,12 @@ import android.util.Log;
                                           final String event,
                                           final GeckoBundle message,
                                           final EventCallback callback);
+
+    protected void handleDefaultMessage(final String event,
+                                        final GeckoBundle message,
+                                        final EventCallback callback) {
+        if (callback != null) {
+            callback.sendError("No delegate registered");
+        }
+    }
 }