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 100 matching lines @@
     /**
      * Manages the view interaction with the rest of the system.
      */
     public interface NewTabPageManager extends MostVisitedItemManager {
         /** @return Whether the location bar is shown in the NTP. */
         boolean isLocationBarShownInNTP();
 
         /** @return Whether voice search is enabled and the microphone should be shown. */
         boolean isVoiceSearchEnabled();
 
+        /** @return Whether the user is signed in. */
+        boolean isUserSignedIn();
+
         /** @return Whether the document mode opt out promo should be shown. */
         boolean shouldShowOptOutPromo();
 
         /** Called when the document mode opt out promo is shown. */
         void optOutPromoShown();
 
         /** Called when the user clicks "settings" or "ok, got it" on the opt out promo. */
         void optOutPromoClicked(boolean settingsClicked);
 
         /** 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 interests dialog. */
+        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 150 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();
@@ skipping 14 matching lines @@
                     RecordUserAction.record("MobileNTP.Snippets.Scrolled");
                     if (mScrolledOnce) return;
                     mScrolledOnce = true;
                     RecordHistogram.recordEnumeratedHistogram(
                             SnippetsManager.SNIPPETS_STATE_HISTOGRAM,
                             SnippetsManager.SNIPPETS_SCROLLED,
                             SnippetsManager.NUM_SNIPPETS_ACTIONS);
                 }
             });
         }
+
+        // Set up interests
+        // TODO(peconn): If the user is not signed in, show Interests button that leads to sign-in.
+        if (CommandLine.getInstance().hasSwitch(ChromeSwitches.ENABLE_NTP_INTERESTS)

[newt (away), 2015/12/14 21:18:39]

Better: add a method isInterestsEnabled() in NewTabPage manager, and put both
the signed in and command line check into the method.

[PEConn, 2015/12/15 11:50:15]

Done.

+                && manager.isUserSignedIn()) {
+            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 609 matching lines @@
             for (MostVisitedItem item : mMostVisitedItems) {
                 if (item.getUrl().equals(url)) {
                     LargeIconCallback iconCallback = new LargeIconCallbackImpl(item, false);
                     mManager.getLargeIconForUrl(url, mMinIconSize, iconCallback);
                     break;
                 }
             }
         }
     }
 }