Pass load events from prerenders to launching elements.

chrome/renderer/prerender/prerender_dispatcher.cc

Index: chrome/renderer/prerender/prerender_dispatcher.cc
diff --git a/chrome/renderer/prerender/prerender_dispatcher.cc b/chrome/renderer/prerender/prerender_dispatcher.cc
index d9c4b93c3e86c834bee8658608e3293f61e84b6b..b024053af616862a0906ec29af22ec1a3d7e0d7b 100644
--- a/chrome/renderer/prerender/prerender_dispatcher.cc
+++ b/chrome/renderer/prerender/prerender_dispatcher.cc
@@ -46,6 +46,19 @@ void PrerenderDispatcher::OnPrerenderStart(int prerender_id) {
   OnPrerenderAddAlias(prerender_id, prerender.url());
 }
 
+void PrerenderDispatcher::OnPrerenderStopLoading(int prerender_id) {
+  DCHECK_NE(0u, prerenders_.count(prerender_id));
+  std::map<int, WebPrerender>::iterator it = prerenders_.find(prerender_id);
+
+  WebPrerender& prerender = it->second;
+
+  // The prerender should only be null in unit tests.

[mmenke, 2012/12/27 19:11:08]

Do unit tests actually simulate this event?

[gavinp, 2012/12/28 13:23:15]

Yes. See PrerenderDispatcherTest.PrerenderDispatcherSingleRemove.

[mmenke, 2012/12/28 18:48:36]

It calls OnPrerenderStop, not OnPrerenderStopLoading (You'd actually need a new
unit test to call this function, since it didn't exist before, and is only
called by OnControlMessageReceived)

[gavinp, 2012/12/28 20:13:16]

Right. And since this function is a NOP and untestable from the unit test, I've
upgraded this test to a DCHECK(). 

+  if (prerender.isNull())
+    return;
+
+  prerender.didSendLoadForPrerender();
+}
+
 void PrerenderDispatcher::OnPrerenderAddAlias(int prerender_id,
                                               const GURL& url) {
   DCHECK_NE(0u, prerenders_.count(prerender_id));
@@ -84,6 +97,8 @@ bool PrerenderDispatcher::OnControlMessageReceived(
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PrerenderDispatcher, message)
     IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderStart, OnPrerenderStart)
+    IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderStopLoading,
+                        OnPrerenderStopLoading)
     IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderAddAlias, OnPrerenderAddAlias)
     IPC_MESSAGE_HANDLER(PrerenderMsg_OnPrerenderStop, OnPrerenderStop)
     IPC_MESSAGE_UNHANDLED(handled = false)