Implement ResourceQueue, an object that makes it easy to delay starting

chrome/browser/renderer_host/async_resource_handler.cc

 // Copyright (c) 2009 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/browser/renderer_host/async_resource_handler.h"
 
 #include "base/logging.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
+#include "chrome/browser/renderer_host/global_request_id.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host_request_info.h"
 #include "chrome/common/render_messages.h"
 #include "net/base/io_buffer.h"
 
 namespace {
 
 // When reading, we don't know if we are going to get EOF (0 bytes read), so
 // we typically have a buffer that we allocated but did not use.  We keep
 // this buffer around for the next read as a small optimization.
 SharedIOBuffer* g_spare_read_buffer = NULL;
@@ skipping 77 matching lines @@
 }
 
 bool AsyncResourceHandler::OnResponseStarted(int request_id,
                                              ResourceResponse* response) {
   // For changes to the main frame, inform the renderer of the new URL's zoom
   // level before the request actually commits.  This way the renderer will be
   // able to set the zoom level precisely at the time the request commits,
   // avoiding the possibility of zooming the old content or of having to layout
   // the new content twice.
   URLRequest* request = rdh_->GetURLRequest(
-      ResourceDispatcherHost::GlobalRequestID(process_id_, request_id));
+      GlobalRequestID(process_id_, request_id));
   ResourceDispatcherHostRequestInfo* info = rdh_->InfoForRequest(request);
   if (info->resource_type() == ResourceType::MAIN_FRAME) {
     std::string host(request->url().host());
     ChromeURLRequestContext* context =
         static_cast<ChromeURLRequestContext*>(request->context());
     if (!host.empty() && context) {
       receiver_->Send(new ViewMsg_SetZoomLevelForLoadingHost(info->route_id(),
           host, context->host_zoom_map()->GetZoomLevel(host)));
     }
   }
@@ skipping 90 matching lines @@
 
 // static
 void AsyncResourceHandler::GlobalCleanup() {
   if (g_spare_read_buffer) {
     // Avoid the CHECK in SharedIOBuffer::~SharedIOBuffer().
     SharedIOBuffer* tmp = g_spare_read_buffer;
     g_spare_read_buffer = NULL;
     tmp->Release();
   }
 }