Implement native functions to query custom search engines for Android

chrome/browser/search_engines/template_url_service_android.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_ANDROID_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_ANDROID_H_
 
 #include <memory>
 
 #include "base/android/jni_weak_ref.h"
@@ skipping 21 matching lines @@
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   jint GetTemplateUrlCount(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& obj);
   jboolean IsLoaded(JNIEnv* env,
                     const base::android::JavaParamRef<jobject>& obj);
   base::android::ScopedJavaLocalRef<jobject> GetPrepopulatedTemplateUrlAt(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jint index);
+  base::android::ScopedJavaLocalRef<jobject> GetRecentTemplateUrlAt(

[Ian Wen, 2016/09/15 22:26:03]

I would remove this function. Reason stated below. 

[ltian, 2016/09/16 00:23:18]

Done.

+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      jint index);
   jboolean IsSearchProviderManaged(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   jboolean IsSearchByImageAvailable(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   jboolean IsDefaultSearchEngineGoogle(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   base::android::ScopedJavaLocalRef<jstring> GetUrlForSearchQuery(
@@ skipping 37 matching lines @@
 
   // Pointer to the TemplateUrlService for the main profile.
   TemplateURLService* template_url_service_;
 
   std::unique_ptr<TemplateURLService::Subscription> template_url_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(TemplateUrlServiceAndroid);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_ANDROID_H_