Merge M54: Load live version when reloading an offline page on connected network

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 9e283ad498a80e2bd67aa55ef99af7ca420842ab..d31e756b86c3718b54bcb2c72fa7651e0ba9b1ee 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
@@ -475,6 +475,15 @@ public class OfflinePageBridge {
         nativeCheckMetadataConsistency(mNativeOfflinePageBridge);
     }
 
+    /**
+     * Retrieves the extra request header to reload the offline page.
+     * @param webContents Contents of the page to reload.
+     * @return The extra request header string.
+     */
+    public String getOfflinePageHeaderForReload(WebContents webContents) {
+        return nativeGetOfflinePageHeaderForReload(mNativeOfflinePageBridge, webContents);
+    }
+
     private static class CheckPagesExistOfflineCallbackInternal {
         private Callback<Set<String>> mCallback;
 
@@ -632,4 +641,6 @@ public class OfflinePageBridge {
     private native void nativeDeletePages(
             long nativeOfflinePageBridge, Callback<Integer> callback, long[] offlineIds);
     private native void nativeCheckMetadataConsistency(long nativeOfflinePageBridge);
+    private native String nativeGetOfflinePageHeaderForReload(
+            long nativeOfflinePageBridge, WebContents webContents);
 }