[Downloads] Add Incognito support

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

Index: chrome/android/java/src/org/chromium/chrome/browser/BasicNativePage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/BasicNativePage.java b/chrome/android/java/src/org/chromium/chrome/browser/BasicNativePage.java
index a98797e107c5a01067d83b1bfcfdb8ec547ef168..cce11821d427c6d7f4a688a9428fc6c32ddfbe3b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/BasicNativePage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/BasicNativePage.java
@@ -27,7 +27,7 @@ public abstract class BasicNativePage implements NativePage {
     private String mUrl;
 
     public BasicNativePage(Activity activity, Tab tab) {
-        initialize(activity);
+        initialize(activity, tab);
         mActivity = activity;
         mTab = tab;
         mBackgroundColor = ApiCompatibilityUtils.getColor(activity.getResources(),
@@ -49,7 +49,7 @@ public abstract class BasicNativePage implements NativePage {
     /**
      * Subclasses shall implement this method to initialize the UI that they hold.
      */
-    protected abstract void initialize(Activity activity);
+    protected abstract void initialize(Activity activity, Tab tab);
 
     @Override
     public abstract View getView();