[Android] Add options in the context menu of CCT to open in a new Chrome tab or incoginto tab

chrome/android/java/src/org/chromium/chrome/browser/DefaultBrowserInfo.java

+// Copyright 2017 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;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.net.Uri;
+import android.os.AsyncTask;
+
+import org.chromium.base.BuildInfo;
+import org.chromium.base.ContextUtils;
+import org.chromium.chrome.R;
+
+import java.util.ArrayList;
+import java.util.concurrent.ExecutionException;
+
+/**
+ * A utility class for querying information about the default browser setting.
+ */
+public class DefaultBrowserInfo {
+    private static final String SAMPLE_URL = "http://www.madeupdomainforcheck123.com/";
+
+    /** Prevents multi-threads from getting created simultaneously. */

[Maria, 2017/02/16 05:41:11]

A more useful comment would be to say something like "synchronizes background
tasks to retrieve browser information"

[ltian, 2017/02/17 05:52:54]

Done.

+    private static final Object DIR_CREATION_LOCK = new Object();

[Maria, 2017/02/16 05:41:12]

this should be named sDirCreationLock, it's final, but it's not a constant

[ltian, 2017/02/17 05:52:54]

Done.

+
+    private static AsyncTask<Void, Void, ArrayList<String>> sDefaultBrowserFetcher;
+
+    /**
+     * Initialize an AsyncTask for getting menu title of opening a link in default browser.
+     */
+    public static void initBrowserFetcher() {
+        synchronized (DIR_CREATION_LOCK) {
+            if (sDefaultBrowserFetcher == null) {
+                sDefaultBrowserFetcher = new AsyncTask<Void, Void, ArrayList<String>>() {
+                    @Override
+                    protected ArrayList<String> doInBackground(Void... params) {
+                        Context context = ContextUtils.getApplicationContext();
+                        ArrayList<String> menuTitles = new ArrayList<String>(2);
+                        // Store the package label of current application.
+                        menuTitles.add(BuildInfo.getPackageLabel(context));
+
+                        // Check if there is a default handler for the Intent.  If so, store its
+                        // label.
+                        String packageLabel = null;
+                        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(SAMPLE_URL));
+                        PackageManager pm = context.getPackageManager();
+                        ResolveInfo info = pm.resolveActivity(intent, 0);
+                        if (info != null && info.match != 0) {
+                            packageLabel = info.loadLabel(pm).toString();

[Maria, 2017/02/16 05:41:12]

is info.loadLabel() guaranteed to be non-null? Otherwise toString() call will
throw

[ltian, 2017/02/17 05:52:54]

Done.

+                        }
+                        if (packageLabel == null) {
+                            menuTitles.add(
+                                    context.getString(R.string.menu_open_in_product_default));
+                        } else {
+                            menuTitles.add(
+                                    context.getString(R.string.menu_open_in_product, packageLabel));
+                        }
+                        return menuTitles;
+                    }
+                };
+                sDefaultBrowserFetcher.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+            }
+        }
+    }
+
+    /**
+     * @return Title of the menu item for opening a link in the default browser.
+     * @param forceChromeAsDefault Whether the Custom Tab is created by Chrome.
+     */
+    public static String getTitleOpenInDefaultBrowser(final boolean forceChromeAsDefault) {
+        if (sDefaultBrowserFetcher == null) {
+            initBrowserFetcher();
+        }
+        try {
+            // If the Custom Tab was created by Chrome, Chrome should handle the action for the
+            // overflow menu.
+            return forceChromeAsDefault ? sDefaultBrowserFetcher.get().get(0)
+                                        : sDefaultBrowserFetcher.get().get(1);
+        } catch (InterruptedException | ExecutionException e) {
+            return ContextUtils.getApplicationContext().getString(
+                    R.string.menu_open_in_product_default);
+        }
+    }
+}