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

chrome/renderer/plugins/chrome_plugin_placeholder.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/plugins/chrome_plugin_placeholder.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 194 matching lines @@
                         OnPluginComponentUpdateFailure)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   if (handled)
     return true;
 
   // 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()
 
   return false;
 }
 
 void ChromePluginPlaceholder::OpenAboutPluginsCallback() {
   RenderThread::Get()->Send(
       new ChromeViewHostMsg_OpenAboutPlugins(routing_id()));
 }
@@ skipping 41 matching lines @@
 
 void ChromePluginPlaceholder::OnPluginComponentUpdateSuccess() {
   PluginListChanged();
 }
 
 void ChromePluginPlaceholder::OnPluginComponentUpdateFailure() {
   SetMessage(l10n_util::GetStringFUTF16(IDS_PLUGIN_DOWNLOAD_ERROR_SHORT,
                                         plugin_name_));
 }
 
+void ChromePluginPlaceholder::OnSetPrerenderMode(
+    prerender::PrerenderMode mode) {
+  OnSetIsPrerendering(mode != prerender::NO_PRERENDER);
+}
+
 void ChromePluginPlaceholder::PluginListChanged() {
   if (!GetFrame() || !plugin())
     return;
 
   ChromeViewHostMsg_GetPluginInfo_Output output;
   std::string mime_type(GetPluginParams().mimeType.utf8());
   blink::WebString top_origin =
       GetFrame()->top()->getSecurityOrigin().toString();
   render_frame()->Send(
       new ChromeViewHostMsg_GetPluginInfo(routing_id(),
@@ skipping 127 matching lines @@
 
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnablePluginPlaceholderTesting)) {
     builder.SetMethod<void (ChromePluginPlaceholder::*)()>(
         "didFinishIconRepositionForTesting",
         &ChromePluginPlaceholder::DidFinishIconRepositionForTestingCallback);
   }
 
   return builder;
 }