Bug 1548960 - Call super.onAttachedToWindow from GeckoView even when we have no session set. r=geckoview-reviewers,snorp

Differential Revision: https://phabricator.services.mozilla.com/D29916

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

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

@@ -457,16 +457,15 @@ public class GeckoView extends FrameLayout {
 
     @Override
     public void onAttachedToWindow() {
-        if (mSession == null) {
+        if (mSession != null && mRuntime != null) {
+            if (!mSession.isOpen()) {
+                mSession.open(mRuntime);
+            }
+            mRuntime.orientationChanged();
+        } else {
             Log.w(LOGTAG, "No GeckoSession attached to this GeckoView instance. Call setSession to attach a GeckoSession to this instance.");
-            return;
         }
 
-        if (!mSession.isOpen()) {
-            mSession.open(mRuntime);
-        }
-        mRuntime.orientationChanged();
-
         super.onAttachedToWindow();
     }