Add the UI for the Interests Prototype.

chrome/android/java/src/org/chromium/chrome/browser/ntp/InterestsService.java

 // 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.
 
 package org.chromium.chrome.browser.ntp;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.browser.profiles.Profile;
 
 /**
  * Retrieve the user's interests.
  */
 public class InterestsService {
+    public static final String AUTH_SCOPE =
+            "https://www.googleapis.com/auth/googlenow";

[Marc Treib, 2015/09/18 13:26:04]

Hm. Shouldn't the InterestsService itself (probably the native version) be
responsible for fetching a properly-scoped access token, given a signed-in
profile?

[tache, 2015/09/21 15:35:55]

I don't think so. Looking at the OAuth2TokenService (java) it uses the android
AccountManager. This allows it to show popups / notifications asking for the
user's permission.

I assume that how you get a valid token is platform specific and thus the
InterestsFetcher shouldn't be responsible for it.

I could move the AUTH_SCOPE to the native part and exposes through JNI to Java.

[Marc Treib, 2015/09/21 16:20:08]

The native ProfileOAuth2TokenService works on all platforms, it has some
platform-specific implementation parts I think (which for Android probably
forward to the Java one).
You can look at PermissionRequestCreatorApiary for an example.
Nah, if it's only used in Java, then that's where it should live.

+
     private long mNativeInterestsService;
 
     /**
      * A user's interest.
      */
     public static class Interest {
         private String mName;
         private String mImageUrl;
         private double mRelevance;
 
@@ skipping 67 matching lines @@
     @CalledByNative
     public static Interest createInterest(String name, String imageUrl, double relevance) {
         return new Interest(name, imageUrl, relevance);
     }
 
     private native long nativeInit(Profile profile);
     private native void nativeDestroy(long nativeInterestsService);
     private native void nativeGetInterests(
             long nativeInterestsService, String token, GetInterestsCallback callback);
 }