[Android WebView] Synthesize a fake page loading event on page source modification (Re-land)

android_webview/native/aw_web_contents_delegate.cc

 // Copyright (c) 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.
 
 #include "android_webview/native/aw_web_contents_delegate.h"
 
 #include "android_webview/browser/aw_javascript_dialog_manager.h"
 #include "android_webview/browser/find_helper.h"
 #include "android_webview/native/aw_contents.h"
 #include "android_webview/native/aw_contents_io_thread_client_impl.h"
@@ skipping 145 matching lines @@
     // DeleteSoon as WebContentsImpl may call methods on |new_contents|
     // after this method returns.
     base::MessageLoop::current()->DeleteSoon(FROM_HERE, new_contents);
   }
 
   if (was_blocked) {
     *was_blocked = !create_popup;
   }
 }
 
+void AwWebContentsDelegate::NavigationStateChanged(
+    content::WebContents* source,
+    content::InvalidateTypes changed_flags) {
+  JNIEnv* env = AttachCurrentThread();
+
+  ScopedJavaLocalRef<jobject> java_delegate = GetJavaDelegate(env);
+  if (java_delegate.obj()) {
+    Java_AwWebContentsDelegate_navigationStateChanged(env, java_delegate.obj(),
+                                                      changed_flags);
+  }
+}
+
 // Notifies the delegate about the creation of a new WebContents. This
 // typically happens when popups are created.
 void AwWebContentsDelegate::WebContentsCreated(
     WebContents* source_contents,
     int opener_render_frame_id,
     const base::string16& frame_name,
     const GURL& target_url,
     content::WebContents* new_contents) {
   AwContentsIoThreadClientImpl::RegisterPendingContents(new_contents);
 }
@@ skipping 92 matching lines @@
   DVLOG(0) << "File Chooser result: mode = " << mode
            << ", file paths = " << JoinString(file_path_str, ":");
   rvh->FilesSelectedInChooser(files, mode);
 }
 
 bool RegisterAwWebContentsDelegate(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview