Add the UI for the Interests Prototype.

chrome/android/java/src/org/chromium/chrome/browser/ntp/InterestsPage.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 android.app.Activity;
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.NativePage;
+import org.chromium.chrome.browser.ntp.InterestsService.GetInterestsCallback;
+import org.chromium.chrome.browser.ntp.InterestsService.Interest;
+import org.chromium.chrome.browser.profiles.Profile;
+import org.chromium.chrome.browser.tab.Tab;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * List the interests of the user. When an interest is clicked the user is redirect to a google
+ * search with news about that subject.
+ */
+public class InterestsPage implements NativePage {

[newt (away), 2015/09/29 17:33:22]

Will this ever be displayed as a webpage, or only as a dialog? If it's only ever
a dialog, then there's no reason to implement NativePage. But perhaps on tablet,
you want it to be a page instead of a dialog?

+    private final Profile mProfile;
+    private final InterestsPageView mPageView;
+    private final String mTitle;
+    private final int mBackgroundColor;
+
+    private static final String TAG = "cr.browser.ntp";

[Bernhard Bauer, 2015/09/29 14:33:28]

Tags are not supposed to start with "cr." anymore; the logging system will
automatically append it.

[PEConn, 2015/11/18 15:26:57]

Done.

+
+    /**
+     * Creates a InterestsPage to be shown in document mode.
+     *
+     * @param context The view context for showing the page.
+     * @param tab The tab from which interests page is loaded.
+     * @param profile The profile from which to load interests.
+     * @param listener The InterestsSelectedListener to notify when the user clicks an interest.
+     * @param activity The activity from which the interests page is loaded.
+     */
+    public InterestsPage(Context context, Tab tab, final Profile profile,
+            InterestsListener listener, Activity activity) {
+        mProfile = profile;
+        mTitle = context.getResources().getString(R.string.ntp_interests);
+        mBackgroundColor = context.getResources().getColor(R.color.ntp_bg);
+
+        LayoutInflater inflater = LayoutInflater.from(context);
+
+        mPageView = (InterestsPageView) inflater.inflate(R.layout.interests_page, null);
+        mPageView.setListener(listener);
+
+        new InterestsService(profile).getInterests(
+                new GetInterestsCallback() {
+                    @Override
+                    public void onInterestsAvailableCallback(Interest[] interests) {
+                        List<Interest> interestList = Arrays.asList(interests);
+
+                        mPageView.setInterests(interestList);
+                    }
+                });
+

[newt (away), 2015/09/29 17:33:22]

remove empty line

[PEConn, 2015/11/18 15:26:57]

Done.

+    }
+
+    /**
+     * Interface to be notified when the user clicks on a interest.
+     **/
+    public interface InterestsListener {
+        /**
+         * Called when a interest is selected.
+         *
+         * @param name The name of the selected interest.
+         */
+        void onInterestClicked(String name);
+    }
+
+    @Override
+    public String getTitle() {
+        return mTitle;
+    }
+
+    @Override
+    public int getBackgroundColor() {
+        return mBackgroundColor;
+    }
+
+    @Override
+    public View getView() {
+        return mPageView;
+    }
+
+    /**
+     * Releases internal resources. This must be called eventually, and the object should not used

[Bernhard Bauer, 2015/09/29 14:33:28]

This comment is unnecessary.

[PEConn, 2015/11/18 15:26:57]

Done.

+     * after calling this.
+     */
+    @Override
+    public void destroy() {
+    }
+
+    @Override
+    public String getHost() {
+        return "interests";
+    }
+
+    @Override
+    public String getUrl() {
+        return "chrome-native://interests";

[newt (away), 2015/09/29 17:33:22]

If this does need to be a NativePage, then add the URL and host to
UrlConstants.java instead of hardcoding them here.

+    }
+
+    @Override
+    public void updateForUrl(String url) {
+    }
+}