Add the JNI code in order to let Java use the InterestsFetcher.

chrome/browser/android/interests_service.h

+// Copyright 2015 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_ANDROID_INTERESTS_SERVICE_H_
+#define CHROME_BROWSER_ANDROID_INTERESTS_SERVICE_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "chrome/browser/interests/interests_fetcher.h"
+#include "chrome/browser/profiles/profile.h"
+
+// Provides a list of user interests to Java
+class InterestsService {
+ public:
+  explicit InterestsService(Profile *profile);

[Marc Treib, 2015/09/11 14:54:25]

* goes with the type, also in a few other places

[tache, 2015/09/11 15:45:09]

Done.

+  void Destroy(JNIEnv* env, jobject obj);
+  void OnLoadingComplete(JNIEnv *env, jobject obj);

[Marc Treib, 2015/09/11 14:54:25]

This method doesn't actually exist, please remove the declaration.

[tache, 2015/09/11 15:45:09]

Done.

+
+  void GetInterests(JNIEnv* env,
+                    jobject obj,
+                    jstring token,
+                    jobject j_callback);
+
+  static jobjectArray ConvertInterestsToJava(
+      const std::vector<InterestsFetcher::Interest>& interests);
+
+  static bool Register(JNIEnv* env);
+  virtual ~InterestsService();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InterestsService);

[Marc Treib, 2015/09/11 14:54:25]

By convention, this goes right at the end of the class.

[tache, 2015/09/11 15:45:09]

Done.

+
+  void OnObtainedInterests(
+      InterestsFetcher* fetcher,
+      scoped_ptr<base::android::ScopedJavaGlobalRef<jobject>> j_callback,
+      const std::vector<InterestsFetcher::Interest>& interests);
+
+
+  Profile *profile_;
+
+  base::WeakPtrFactory<InterestsService> weak_ptr_factory_;
+};
+
+#endif  // CHROME_BROWSER_ANDROID_INTERESTS_SERVICE_H_