[Offline pages] Introducing Open online button in OIB

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

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
index c0a27ec49c72c028324b2ad90a6c7dd266e5111b..8f97ad442a95563619e3a065d0a6bd4f9fe9f11c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
@@ -31,9 +31,11 @@ import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.components.bookmarks.BookmarkId;
 import org.chromium.components.offlinepages.SavePageResult;
+import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.net.ConnectionType;
 import org.chromium.net.NetworkChangeNotifier;
+import org.chromium.ui.base.PageTransition;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -555,6 +557,19 @@ public class OfflinePageUtils {
         return offlinePageBridge.isShowingOfflinePreview(tab.getWebContents());
     }
 
+    /**
+     * Reloads specified tab, which should allow to open an online version of the page.
+     * @param tab The tab to be reloaded.
+     */
+    public static void reload(Tab tab) {
+        // If current page is an offline page, reload it with custom behavior defined in extra
+        // header respected.
+        LoadUrlParams params =
+                new LoadUrlParams(tab.getOriginalUrl(), PageTransition.RELOAD);
+        params.setVerbatimHeaders(getOfflinePageHeaderForReload(tab));
+        tab.loadUrl(params);
+    }
+
     private static boolean isPowerConnected(Intent batteryStatus) {
         int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
         boolean isConnected = (status == BatteryManager.BATTERY_STATUS_CHARGING