[Android] Make BookmarkModelObserver more convenient.

chrome/browser/android/bookmarks/bookmarks_bridge.cc

 // Copyright 2013 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 "chrome/browser/android/bookmarks/bookmarks_bridge.h"
 
 #include "base/android/jni_string.h"
 #include "base/containers/stack_container.h"
 #include "base/i18n/string_compare.h"
 #include "base/prefs/pref_service.h"
@@ skipping 136 matching lines @@
 }
 
 ScopedJavaLocalRef<jobject> BookmarksBridge::GetBookmarkByID(JNIEnv* env,
                                                              jobject obj,
                                                              jlong id,
                                                              jint type) {
   DCHECK(IsLoaded());
   return CreateJavaBookmark(GetNodeByID(id, type));
 }
 
+bool BookmarksBridge::IsDoingExtensiveChanges(JNIEnv* env, jobject obj) {
+  return bookmark_model_->IsDoingExtensiveChanges();
+}
+
 void BookmarksBridge::GetPermanentNodeIDs(JNIEnv* env,
                                           jobject obj,
                                           jobject j_result_obj) {
   // TODO(kkimlabs): Remove this function.
   DCHECK(IsLoaded());
 
   base::StackVector<const BookmarkNode*, 8> permanent_nodes;
 
   // Save all the permanent nodes.
   const BookmarkNode* root_node = bookmark_model_->root_node();
@@ skipping 700 matching lines @@
   BookmarkModelChanged();
 }
 
 void BookmarksBridge::PartnerShimLoaded(PartnerBookmarksShim* shim) {
   NotifyIfDoneLoading();
 }
 
 void BookmarksBridge::ShimBeingDeleted(PartnerBookmarksShim* shim) {
   partner_bookmarks_shim_ = NULL;
 }