Restore overhaul

 Bug: 5069192
 Store thumbnails in a database restored async for each tab
 Fix restoring a tab not restoring its current state

Change-Id: I2c14e352638aac0ef766fb3bf4036ff220c53ecd
diff --git a/src/com/android/browser/PreloadController.java b/src/com/android/browser/PreloadController.java
index 652ea8e..08e223f 100644
--- a/src/com/android/browser/PreloadController.java
+++ b/src/com/android/browser/PreloadController.java
@@ -276,4 +276,9 @@
         if (LOGD_ENABLED) Log.d(LOGTAG, "hideAutoLogin()");
     }
 
+    @Override
+    public boolean shouldCaptureThumbnails() {
+        return false;
+    }
+
 }