Browser Plugin: Implement CanGoBack/CanGoForward

content/renderer/browser_plugin/browser_plugin_manager_impl.cc

Index: content/renderer/browser_plugin/browser_plugin_manager_impl.cc
diff --git a/content/renderer/browser_plugin/browser_plugin_manager_impl.cc b/content/renderer/browser_plugin/browser_plugin_manager_impl.cc
index d4027f3cc3c40e2962385a7275a2ccf5f6d11ab6..b0340b60475f64ba47f0ece24201e835e2dbb23a 100644
--- a/content/renderer/browser_plugin/browser_plugin_manager_impl.cc
+++ b/content/renderer/browser_plugin/browser_plugin_manager_impl.cc
@@ -44,6 +44,8 @@ bool BrowserPluginManagerImpl::OnControlMessageReceived(
     IPC_MESSAGE_HANDLER(BrowserPluginMsg_LoadStart, OnLoadStart)
     IPC_MESSAGE_HANDLER(BrowserPluginMsg_LoadAbort, OnLoadAbort)
     IPC_MESSAGE_HANDLER(BrowserPluginMsg_LoadRedirect, OnLoadRedirect)
+    IPC_MESSAGE_HANDLER(BrowserPluginMsg_NavigationStateUpdate,
+                        OnNavigationStateUpdate)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -111,4 +113,12 @@ void BrowserPluginManagerImpl::OnLoadRedirect(int instance_id,
     plugin->LoadRedirect(old_url, new_url, is_top_level);
 }
 
+void BrowserPluginManagerImpl::OnNavigationStateUpdate(int instance_id,
+                                                       int current_entry_index,
+                                                       int entry_count) {
+  BrowserPlugin* plugin = GetBrowserPlugin(instance_id);
+  if (plugin)
+    plugin->NavigationStateUpdate(current_entry_index, entry_count);
+}
+
 }  // namespace content