**NOTFORLANDING** New link rel=prerender API

chrome/browser/renderer_host/chrome_render_message_filter.cc

 // Copyright (c) 2012 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/chrome_render_message_filter.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/automation/automation_resource_message_filter.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_message_service.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/metrics/histogram_synchronizer.h"
 #include "chrome/browser/nacl_host/nacl_process_host.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
 #include "chrome/browser/net/predictor.h"
+#include "chrome/browser/prerender/prerender_link_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_file_util.h"
 #include "chrome/common/extensions/extension_message_bundle.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/render_messages.h"
+#include "chrome/common/prerender_messages.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/process_type.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 #include "webkit/plugins/npapi/plugin_list.h"
 
 #if defined(USE_TCMALLOC)
@@ skipping 59 matching lines @@
                         OnWriteTcmallocHeapProfile)
 #endif
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_AllowDatabase, OnAllowDatabase)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_AllowDOMStorage, OnAllowDOMStorage)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_AllowFileSystem, OnAllowFileSystem)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_AllowIndexedDB, OnAllowIndexedDB)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_CanTriggerClipboardRead,
                         OnCanTriggerClipboardRead)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_CanTriggerClipboardWrite,
                         OnCanTriggerClipboardWrite)
+    IPC_MESSAGE_HANDLER(PrerenderMsg_NewLinkPrerender, OnNewLinkPrerender)

[cbentzel, 2012/03/29 00:13:37]

Could these get moved to a separate class which is a WebContentsObserver?
Perhaps PrerenderTabHelper? 

[gavinp, 2012/04/20 17:54:15]

Prerendering is confusing enough without mixing up the target and the launcher
more than we do already.  I created a PrerenderMessageFilter which catches these
messages.

+    IPC_MESSAGE_HANDLER(PrerenderMsg_RemovedLinkPrerender,
+                        OnRemovedLinkPrerender)
+    IPC_MESSAGE_HANDLER(PrerenderMsg_UnloadedLinkPrerender,
+                        OnUnloadedLinkPrerender)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
 #if defined(ENABLE_AUTOMATION)
   if ((message.type() == ChromeViewHostMsg_GetCookies::ID ||
        message.type() == ChromeViewHostMsg_SetCookie::ID) &&
     AutomationResourceMessageFilter::ShouldFilterCookieMessages(
         render_process_id_, message.routing_id())) {
     // ChromeFrame then we need to get/set cookies from the external host.
     IPC_BEGIN_MESSAGE_MAP_EX(ChromeRenderMessageFilter, message,
@@ skipping 384 matching lines @@
 
 void ChromeRenderMessageFilter::OnSetCookie(const IPC::Message& message,
                                             const GURL& url,
                                             const GURL& first_party_for_cookies,
                                             const std::string& cookie) {
 #if defined(ENABLE_AUTOMATION)
   AutomationResourceMessageFilter::SetCookiesForUrl(
       render_process_id_, message.routing_id(), url, cookie);
 #endif
 }
+
+void ChromeRenderMessageFilter::OnNewLinkPrerender(
+    int prerender_id,
+    int render_view_route_id,
+    const GURL& url,
+    const content::Referrer& referrer,
+    const gfx::Size& size) {
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &prerender::PrerenderLinkManager::OnNewLinkPrerender,
+          profile_, prerender_id, render_process_id_, render_view_route_id,
+          url, referrer, size));
+}
+
+void ChromeRenderMessageFilter::OnRemovedLinkPrerender(
+    int prerender_id) {
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &prerender::PrerenderLinkManager::OnRemovedLinkPrerender,
+          profile_, prerender_id, render_process_id_));
+}
+void ChromeRenderMessageFilter::OnUnloadedLinkPrerender(
+    int prerender_id) {
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &prerender::PrerenderLinkManager::OnUnloadedLinkPrerender,
+          profile_, prerender_id, render_process_id_));
+}