Add the UI for the Interests Prototype.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
index 2edbf6eaf404192a0a77899c15165133e9f358f4..f0d85b6acaf845f29f489f245bf04d20ac558337 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
@@ -32,6 +32,7 @@ import org.chromium.chrome.browser.favicon.FaviconHelper.FaviconImageCallback;
 import org.chromium.chrome.browser.favicon.LargeIconBridge;
 import org.chromium.chrome.browser.favicon.LargeIconBridge.LargeIconCallback;
 import org.chromium.chrome.browser.ntp.BookmarksPage.BookmarkSelectedListener;
+import org.chromium.chrome.browser.ntp.InterestsPage.InterestsListener;
 import org.chromium.chrome.browser.ntp.LogoBridge.Logo;
 import org.chromium.chrome.browser.ntp.LogoBridge.LogoObserver;
 import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
@@ -53,6 +54,8 @@ import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.ui.base.DeviceFormFactor;
 import org.chromium.ui.base.PageTransition;
 
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -159,6 +162,16 @@ public class NewTabPage
         }
     }
 
+    public static void launchInterestsDialog(Activity activity, Tab tab) {
+        InterestDialogSelectedListener listener = new InterestDialogSelectedListener(tab);
+        NativePage page = new InterestsPage(activity, tab, Profile.getLastUsedProfile(),
+                listener, activity);
+        Dialog dialog = new NativePageDialog(activity, page);
+        listener.setDialog(dialog);
+
+        dialog.show();
+    }
+
     public static void launchRecentTabsDialog(Activity activity, Tab tab) {
         DocumentRecentTabsManager manager = new DocumentRecentTabsManager(tab, activity);
         NativePage page = new RecentTabsPage(activity, manager);
@@ -611,4 +624,38 @@ public class NewTabPage
             mDialog = dialog;
         }
     }
+
+    private static class InterestDialogSelectedListener implements InterestsListener {
+        private static final String GOOGLE_SEARCH_URL_PATTERN =
+                "https://www.google.com/search?tbm=nws&q=%s";
+        private Dialog mDialog;
+        private final Tab mTab;
+
+        public InterestDialogSelectedListener(Tab tab) {
+            mTab = tab;
+        }
+
+        @Override
+        public void onInterestClicked(String name) {
+            if (mDialog == null) {

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

When would this happen?

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

Done.

+                return;
+            }
+
+            try {
+                String url = String.format(GOOGLE_SEARCH_URL_PATTERN,

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

I think you want TemplateUrlService.getInstance().getUrlForSearchQuery() here.

Creating Google search URLs manually is fraught with peril, and you definitely
shouldn't be doing that. For example, one immediate problem: this always
searches google.com, never google.co.uk or bing.fr or whatever the user's
default search engine is. (If you need to add custom query params to the URL,
you might need to modify or add a new method to TemplateUrlService.)

Also, how does this interact with non-Google search engines?

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

Done.

+                        URLEncoder.encode(name, "UTF-8"));
+
+                mTab.loadUrl(new LoadUrlParams(url));
+            } catch (UnsupportedEncodingException e) {
+                // Don't redirect the tab if we have failed to encode the url. This should not
+                // happen.
+            }
+
+            mDialog.dismiss();
+        }
+
+        public void setDialog(Dialog dialog) {
+            mDialog = dialog;
+        }
+    }
 }