Create the bookmark adapter in a background thread.

Handling it asynchronously prevented an ANR but it still took forever with large
databases.

Bug: 2581894
Change-Id: I273375e439d7e3ac048728aabb39c6920fa87e5a
diff --git a/src/com/android/browser/BrowserBookmarksAdapter.java b/src/com/android/browser/BrowserBookmarksAdapter.java
index 03e3e5d..241b33b 100644
--- a/src/com/android/browser/BrowserBookmarksAdapter.java
+++ b/src/com/android/browser/BrowserBookmarksAdapter.java
@@ -28,6 +28,7 @@
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.Looper;
 import android.provider.Browser;
 import android.provider.Browser.BookmarkColumns;
 import android.view.KeyEvent;
@@ -551,7 +552,7 @@
 
     private class ChangeObserver extends ContentObserver {
         public ChangeObserver() {
-            super(new Handler());
+            super(new Handler(Looper.getMainLooper()));
         }
 
         @Override