Added a 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 {
-    private long mNativeInterestsService;
-
-    /**
-     * A user's interest.
-     */
-    public static class Interest {
-        private final String mName;
-        private final String mImageUrl;
-        private final double mRelevance;
-
-        public Interest(String name, String imageUrl, double relevance) {
-            mName = name;
-            mImageUrl = imageUrl;
-            mRelevance = relevance;
-        }
-
-        public String getName() {
-            return mName;
-        }
-
-        public String getImageUrl() {
-            return mImageUrl;
-        }
-
-        public double getRelevance() {
-            return mRelevance;
-        }
-    }
-    /**
-     * Interface for receiving the interests of a user.
-     */
-    public interface GetInterestsCallback {
-        /**
-         * Callback method for fetching the interests of a user.
-         *
-         * @param interests The array of interests. Null if error.
-         */
-        @CalledByNative("GetInterestsCallback")
-        public void onInterestsAvailableCallback(Interest[] interests);
-    }
-
-    /**
-     * InterestsService constructor requires a valid user profile object.
-     *
-     * @param profile The profile for which to fetch the interests
-     */
-    public InterestsService(Profile profile) {
-        mNativeInterestsService = nativeInit(profile);
-    }
-
-    /**
-     * Cleans up the C++ side of this class. This instance must not be used after calling destroy().
-     */
-    public void destroy() {
-        assert mNativeInterestsService != 0;
-        nativeDestroy(mNativeInterestsService);
-        mNativeInterestsService = 0;
-    }
-
-    public void getInterests(final GetInterestsCallback callback) {
-        GetInterestsCallback wrappedCallback = new GetInterestsCallback() {
-            @Override
-            public void onInterestsAvailableCallback(Interest[] interests) {
-                callback.onInterestsAvailableCallback(interests);
-            }
-        };
-
-        nativeGetInterests(mNativeInterestsService, wrappedCallback);
-    }
-
-    /*
-     * Helper methods for the native part.
-     */
-    @CalledByNative
-    private static Interest createInterest(String name, String imageUrl, double relevance) {
-        return new Interest(name, imageUrl, relevance);
-    }
-
-    @CalledByNative
-    private static Interest[] createInterestsArray(int size) {
-        return new Interest[size];
-    }
-
-    private native long nativeInit(Profile profile);
-    private native void nativeDestroy(long nativeInterestsService);
-    private native void nativeGetInterests(
-            long nativeInterestsService, GetInterestsCallback callback);
-}