Added a UI for the Interests Prototype.

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.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.annotation.SuppressLint;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
@@ skipping 116 matching lines @@
 
         /** Opens the bookmarks page in the current tab. */
         void navigateToBookmarks();
 
         /** Opens the recent tabs page in the current tab. */
         void navigateToRecentTabs();
 
         /** Opens a given URL in the current tab. */
         void open(String url);
 
+        /** Opens the recent tabs page in the current tab. */
+        void navigateToInterests();
+
         /**
          * Animates the search box up into the omnibox and bring up the keyboard.
          * @param beginVoiceSearch Whether to begin a voice search.
          * @param pastedText Text to paste in the omnibox after it's been focused. May be null.
          */
         void focusSearchBox(boolean beginVoiceSearch, String pastedText);
 
         /**
          * Gets the list of most visited sites.
          * @param observer The observer to be notified with the list of sites.
@@ skipping 153 matching lines @@
             public void onClick(View v) {
                 mManager.navigateToRecentTabs();
             }
         });
         toolbar.getBookmarksButton().setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 mManager.navigateToBookmarks();
             }
         });
+        toolbar.getInterestsButton().setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mManager.navigateToInterests();
+            }
+        });
 
         initializeSearchBoxScrollHandling();
         addOnLayoutChangeListener(this);
         setSearchProviderHasLogo(searchProviderHasLogo);
 
         mPendingLoadTasks++;
         mManager.setMostVisitedURLsObserver(this,
                 mMostVisitedDesign.getNumberOfTiles(searchProviderHasLogo));
 
         if (mManager.shouldShowOptOutPromo()) showOptOutPromo();
 
         // Set up snippets
         if (CommandLine.getInstance().hasSwitch(ChromeSwitches.ENABLE_NTP_SNIPPETS)) {
             mSnippetsView = (RecyclerView) findViewById(R.id.snippets_card_list);
             mSnippetsView.setVisibility(View.VISIBLE);
             mSnippetsView.setLayoutManager(new LinearLayoutManager(getContext()));
             mSnippetsManager = new SnippetsManager(mManager, mSnippetsView);
         }
+
+        // Set up interests
+        if (CommandLine.getInstance().hasSwitch(ChromeSwitches.ENABLE_NTP_INTERESTS)) {

[knn, 2015/12/02 14:18:59]

Can we check if user is signed in here?

[PEConn, 2015/12/08 17:27:50]

Done.

+            toolbar.getInterestsButton().setVisibility(View.VISIBLE);
+        }
     }
 
     private int getTabsMovedIllustration() {
         switch (Build.MANUFACTURER.toLowerCase(Locale.US)) {
             case "samsung":
                 if (DocumentModeManager.isDeviceTabbedModeByDefault()) return 0;
                 return R.drawable.tabs_moved_samsung;
             case "htc":
                 return R.drawable.tabs_moved_htc;
             default:
@@ skipping 760 matching lines @@
                 }
             }
         }
 
         @Override
         public boolean preferLargeIcons() {
             return true;
         }
     }
 }