Add "SHOW ALL SAVED PAGES" button to offline error page

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 2943ccbbd932faaf09189b99ecdf8ea3cd35c094..4ec73a6d49b464e6dd8eb7e9c145a060df43ad3c 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -324,6 +324,11 @@ IPC_MESSAGE_ROUTED1(ChromeViewMsg_NetErrorInfo,
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetCanShowNetworkDiagnosticsDialog,
                     bool /* can_show_network_diagnostics_dialog */)
 
+// 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 */)
+
 // Provides the information needed by the renderer process to contact a
 // navigation correction service.  Handled by the NetErrorHelper.
 IPC_MESSAGE_ROUTED5(ChromeViewMsg_SetNavigationCorrectionInfo,
@@ -336,6 +341,10 @@ IPC_MESSAGE_ROUTED5(ChromeViewMsg_SetNavigationCorrectionInfo,
 IPC_MESSAGE_ROUTED1(ChromeViewHostMsg_RunNetworkDiagnostics,
                     GURL /* failed_url */)
 
+// Message sent from the renderer to the browser to show the UI for offline
+// pages.
+IPC_MESSAGE_ROUTED0(ChromeViewHostMsg_ShowOfflinePages)
+
 //-----------------------------------------------------------------------------
 // Misc messages
 // These are messages sent from the renderer to the browser process.