Only show Last N Pages in the UI when the corresponding tab is visible. (cont'd)

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
index 16e4ce0e4c4db9ca1532f5d8f07d77cec6063068..676c39ff27278d77419f5460852771b17acc17f0 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
@@ -439,6 +439,16 @@ public class OfflinePageBridge {
         nativeCheckPagesExistOffline(mNativeOfflinePageBridge, urlArray, callbackInternal);
     }
 
+    /** Tells the native side that a new tab has been added for this profile. */
+    void registerRecentTab(int tabId) {
+        nativeRegisterRecentTab(mNativeOfflinePageBridge, tabId);
+    }
+
+    /** Tells the native side that a new tab has been removed for this profile. */
+    void unregisterRecentTab(int tabId) {
+        nativeUnregisterRecentTab(mNativeOfflinePageBridge, tabId);
+    }
+
     @VisibleForTesting
     static void setOfflineBookmarksEnabledForTesting(boolean enabled) {
         sOfflineBookmarksEnabled = enabled;
@@ -506,12 +516,13 @@ public class OfflinePageBridge {
     private static native boolean nativeIsPageSharingEnabled();
     private static native boolean nativeCanSavePage(String url);
     private static native OfflinePageBridge nativeGetOfflinePageBridgeForProfile(Profile profile);
-
     @VisibleForTesting
     native void nativeGetAllPages(long nativeOfflinePageBridge, List<OfflinePageItem> offlinePages,
             final Callback<List<OfflinePageItem>> callback);
     private native void nativeCheckPagesExistOffline(long nativeOfflinePageBridge, Object[] urls,
             CheckPagesExistOfflineCallbackInternal callback);
+    private native void nativeRegisterRecentTab(long nativeOfflinePageBridge, int tabId);
+    private native void nativeUnregisterRecentTab(long nativeOfflinePageBridge, int tabId);
     @VisibleForTesting
     native void nativeGetRequestsInQueue(
             long nativeOfflinePageBridge, Callback<SavePageRequest[]> callback);