Menu hook plumbed through to RequestCoordinator.

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 061de4560fd764cf93c5245f45f62ea13ec08c79..d70a3821c6cdafd82c7d4e07c47da5fd1b578a0f 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
@@ -414,6 +414,17 @@ public class OfflinePageBridge {
     }
 
     /**
+     * Save the given URL as an offline page when the network becomes available.
+     *
+     * @param url The given URL to save for later
+     * @param ClientId The client for the offline page, and the client's ID.

[jianli, 2016/05/06 20:39:03]

nit: please update comment to
  Client ID for the offline page to be saved later.

[fgorski, 2016/05/06 21:28:10]

also it should say: clientId

[Pete Williamson, 2016/05/06 21:30:28]

Done.

[Pete Williamson, 2016/05/06 21:36:12]

Fixed it to say client ID before I saw your comment, I presume that is good.

+     */
+    public void savePageLater(final String url, final ClientId clientId) {
+        nativeSavePageLater(
+                mNativeOfflinePageBridge, url, clientId.getNamespace(), clientId.getId());
+    }
+
+    /**
      * Deletes an offline page related to a specified bookmark.
      *
      * @param clientId Client ID for which the offline copy will be deleted.
@@ -621,6 +632,8 @@ public class OfflinePageBridge {
             long nativeOfflinePageBridge, String offlineUrl);
     private native void nativeSavePage(long nativeOfflinePageBridge, SavePageCallback callback,
             WebContents webContents, String clientNamespace, String clientId);
+    private native void nativeSavePageLater(
+            long nativeOfflinePageBridge, String url, String clientNamespace, String clientId);
     private native void nativeDeletePages(
             long nativeOfflinePageBridge, DeletePageCallback callback, long[] offlineIds);
     private native void nativeCheckMetadataConsistency(long nativeOfflinePageBridge);