[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 03fc57abe7e0fc2cfd153b7fe8f2f44e4a7961b5..200de445f44c28d22efe190cdb84a4393806de8d 100644
--- a/chrome/renderer/plugins/chrome_plugin_placeholder.cc
+++ b/chrome/renderer/plugins/chrome_plugin_placeholder.cc
@@ -212,7 +212,7 @@ 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()
 
@@ -274,6 +274,11 @@ void ChromePluginPlaceholder::OnPluginComponentUpdateFailure() {
                                         plugin_name_));
 }
 
+void ChromePluginPlaceholder::OnSetPrerenderMode(
+    prerender::PrerenderMode mode) {
+  OnSetIsPrerendering(mode != prerender::NO_PRERENDER);
+}
+
 void ChromePluginPlaceholder::PluginListChanged() {
   if (!GetFrame() || !plugin())
     return;