[Home] Ensure incognito tab model is created when NTP opened

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
index 48d445bdebea2afbaff64017fc1a2bc3c041f57d..8b883d610a9e658d6128ae9063ed693263446bea 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModel.java
@@ -210,6 +210,19 @@ public interface TabModel extends TabList {
     void removeTab(Tab tab);
 
     /**
+     * Indicates that a new tab may be added to the model soon. Allows the model to initialize
+     * anything necessary for the creation of a tab or perform cleanup once a new tab is no longer
+     * pending addition.
+     * @param isPendingTabAdd Whether a new tab is pending addition to this model.
+     */
+    void setIsPendingTabAdd(boolean isPendingTabAdd);
+
+    /**
+     * Whether a new tab is pending addition to this model.
+     */
+    boolean isPendingTabAdd();
+
+    /**
      * Subscribes a {@link TabModelObserver} to be notified about changes to this model.
      * @param observer The observer to be subscribed.
      */