Convert the PluginService interface to be an async wrapper around PluginList.

content/browser/renderer_host/buffered_resource_handler.cc

 // Copyright (c) 2011 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 "content/browser/renderer_host/buffered_resource_handler.h"
 
 #include <vector>
 
+#include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/content_browser_client.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/plugin_service.h"
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 #include "content/browser/renderer_host/resource_dispatcher_host_delegate.h"
 #include "content/browser/renderer_host/resource_dispatcher_host_request_info.h"
 #include "content/browser/renderer_host/x509_user_cert_resource_handler.h"
 #include "content/common/resource_response.h"
 #include "net/base/io_buffer.h"
 #include "net/base/mime_sniffer.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
-#include "webkit/plugins/npapi/plugin_list.h"
 
 namespace {
 
 void RecordSnifferMetrics(bool sniffing_blocked,
                           bool we_would_like_to_sniff,
                           const std::string& mime_type) {
   static base::Histogram* nosniff_usage(NULL);
   if (!nosniff_usage)
     nosniff_usage = base::BooleanHistogram::FactoryGet(
         "nosniff.usage", base::Histogram::kUmaTargetedHistogramFlag);
@@ skipping 298 matching lines @@
 bool BufferedResourceHandler::ShouldWaitForPlugins() {
   bool need_plugin_list;
   if (!ShouldDownload(&need_plugin_list) || !need_plugin_list)
     return false;
 
   // We don't want to keep buffering as our buffer will fill up.
   ResourceDispatcherHostRequestInfo* info =
       ResourceDispatcherHost::InfoForRequest(request_);
   host_->PauseRequest(info->child_id(), info->request_id(), true);
 
-  // Schedule plugin loading on the file thread.
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE,
-      NewRunnableMethod(this, &BufferedResourceHandler::LoadPlugins));
+  // Get the plugins asynchronously.
+  PluginService::GetInstance()->GetPlugins(
+      base::Bind(&BufferedResourceHandler::OnPluginsLoaded, this));
   return true;
 }
 
 // This test mirrors the decision that WebKit makes in
 // WebFrameLoaderClient::dispatchDecidePolicyForMIMEType.
 bool BufferedResourceHandler::ShouldDownload(bool* need_plugin_list) {
   if (need_plugin_list)
     *need_plugin_list = false;
   std::string type = StringToLowerASCII(response_->response_head.mime_type);
   std::string disposition;
@@ skipping 85 matching lines @@
   // Remove the non-owning pointer to the CrossSiteResourceHandler, if any,
   // from the extra request info because the CrossSiteResourceHandler (part of
   // the original ResourceHandler chain) will be deleted by the next statement.
   info->set_cross_site_handler(NULL);
 
   // This is handled entirely within the new ResourceHandler, so just reset the
   // original ResourceHandler.
   real_handler_ = handler;
 }
 
-void BufferedResourceHandler::LoadPlugins() {
-  std::vector<webkit::WebPluginInfo> plugins;
-  webkit::npapi::PluginList::Singleton()->GetPlugins(&plugins);
-
-  BrowserThread::PostTask(
-      BrowserThread::IO, FROM_HERE,
-      NewRunnableMethod(this, &BufferedResourceHandler::OnPluginsLoaded));
-}
-
-void BufferedResourceHandler::OnPluginsLoaded() {
+void BufferedResourceHandler::OnPluginsLoaded(
+    std::vector<webkit::WebPluginInfo> plugins) {
   wait_for_plugins_ = false;
   if (!request_)
     return;
 
   ResourceDispatcherHostRequestInfo* info =
       ResourceDispatcherHost::InfoForRequest(request_);
   host_->PauseRequest(info->child_id(), info->request_id(), false);
   if (!CompleteResponseStarted(info->request_id(), false))
     host_->CancelRequest(info->child_id(), info->request_id(), false);
 }