[Android WebView] Send WebChromeClient.onReceivedTitle when navigating back

android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegate.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.android_webview;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.components.web_contents_delegate_android.WebContentsDelegateAndroid;
@@ skipping 23 matching lines @@
     @CalledByNative
     public abstract void activateContents();
 
     // Call in response to a prior runFileChooser call.
     protected static native void nativeFilesSelectedInChooser(int processId, int renderId,
             int modeFlags, String[] filePath, String[] displayName);
 
     @Override
     @CalledByNative
     public abstract void navigationStateChanged(int flags);
+
+    // Not an override, because WebContentsDelegateAndroid maps this call
+    // into onLoad{Started|Stopped}.
+    @CalledByNative
+    public abstract void loadingStateChanged();
 }