[Downloads] Add Incognito support

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadActivity.java

 // Copyright 2016 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.download;
 
-import android.app.Activity;
-import android.content.Intent;
 import android.os.Bundle;
 
 import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.SnackbarActivity;
 import org.chromium.chrome.browser.download.ui.DownloadManagerUi;
+import org.chromium.chrome.browser.util.IntentUtils;
 
 /**
  * Activity for managing downloads handled through Chrome.
  */
 public class DownloadActivity extends SnackbarActivity {
     private DownloadManagerUi mDownloadManagerUi;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        mDownloadManagerUi = new DownloadManagerUi(this);
+        boolean isIncognito = IntentUtils.safeGetBooleanExtra(
+                getIntent(), IntentHandler.EXTRA_OPEN_NEW_INCOGNITO_TAB, false);
+        mDownloadManagerUi = new DownloadManagerUi(this, isIncognito);
         setContentView(mDownloadManagerUi.getView());
     }
 
     @Override
     public void onBackPressed() {
         if (!mDownloadManagerUi.onBackPressed()) super.onBackPressed();
     }
 
     @Override
     protected void onDestroy() {
         mDownloadManagerUi.onDestroyed();
         super.onDestroy();
     }
-
-    /**
-     * Convenience method for launching this Activity.
-     * @param activity Activity that is launching this the Downloads page.
-     */
-    public static void launch(Activity activity) {
-        Intent intent = new Intent();
-        intent.setClass(activity, DownloadActivity.class);
-        intent.putExtra(IntentHandler.EXTRA_PARENT_COMPONENT, activity.getComponentName());
-        activity.startActivity(intent);
-    }
 }