Add "Show saved copy" button in dino page when there's offline copy

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index e096a931ac55f5f02da1eea0fb22de14d0c6336d..5083a0e4da31a309145caf08ccad6db102a3bcd4 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -323,10 +323,10 @@ IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetCanShowNetworkDiagnosticsDialog,
                     bool /* can_show_network_diagnostics_dialog */)
 
 #if defined(OS_ANDROID)
-// Tells the renderer whether or not an offline page exists. This is used to
-// decide if "show saved pages" button will be provided on certain error page.
-IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetHasOfflinePages,
-                    bool /* has_offline_pages */)
+// Tells the renderer about the status of the offline pages. This is used to
+// decide if offline related button will be provided on certain error page.
+IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetOfflinePageInfo,
+                    int /* offline_page_status */)
 #endif
 
 // Provides the information needed by the renderer process to contact a
@@ -345,6 +345,11 @@ IPC_MESSAGE_ROUTED1(ChromeViewHostMsg_RunNetworkDiagnostics,
 // Message sent from the renderer to the browser to show the UI for offline
 // pages.
 IPC_MESSAGE_ROUTED0(ChromeViewHostMsg_ShowOfflinePages)
+
+// Message sent from the renderer to the browser to load the offline copy of
+// the page that fails to load due to no internet.
+IPC_MESSAGE_ROUTED1(ChromeViewHostMsg_LoadOfflineCopy,
+                    GURL /* url */)
 #endif
 
 //-----------------------------------------------------------------------------