[Prerender] Change IPC from bool to enum for more prerender modes

chrome/renderer/plugins/chrome_plugin_placeholder.cc

Index: chrome/renderer/plugins/chrome_plugin_placeholder.cc
diff --git a/chrome/renderer/plugins/chrome_plugin_placeholder.cc b/chrome/renderer/plugins/chrome_plugin_placeholder.cc
index 0f35197e27cbaacbde7c35fa4d943306f4e8f3fe..b81200c3803b0a4b58d31597e443c6b892f54ffa 100644
--- a/chrome/renderer/plugins/chrome_plugin_placeholder.cc
+++ b/chrome/renderer/plugins/chrome_plugin_placeholder.cc
@@ -208,7 +208,7 @@ bool ChromePluginPlaceholder::OnMessageReceived(const IPC::Message& message) {
   // We don't swallow these messages because multiple blocked plugins and other
   // objects have an interest in them.
   IPC_BEGIN_MESSAGE_MAP(ChromePluginPlaceholder, message)
-    IPC_MESSAGE_HANDLER(PrerenderMsg_SetIsPrerendering, OnSetIsPrerendering)
+    IPC_MESSAGE_HANDLER(PrerenderMsg_SetIsPrerendering, OnSetPrerenderMode)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_LoadBlockedPlugins, OnLoadBlockedPlugins)
   IPC_END_MESSAGE_MAP()
 
@@ -257,6 +257,11 @@ void ChromePluginPlaceholder::OnCancelledDownloadingPlugin() {
 }
 #endif  // defined(ENABLE_PLUGIN_INSTALLATION)
 
+void ChromePluginPlaceholder::OnSetPrerenderMode(
+    prerender::PrerenderMode mode) {
+  OnSetIsPrerendering(mode != prerender::NO_PRERENDER);
+}
+
 void ChromePluginPlaceholder::PluginListChanged() {
   if (!GetFrame() || !plugin())
     return;