Handle interface to prerenders.

chrome/browser/predictors/autocomplete_action_predictor.cc

Index: chrome/browser/predictors/autocomplete_action_predictor.cc
diff --git a/chrome/browser/predictors/autocomplete_action_predictor.cc b/chrome/browser/predictors/autocomplete_action_predictor.cc
index c5ce8a101053afaf06d508d0849c689bb1c83edd..ef142e42b5da960ce8b4d59cac5e898f3ec9573e 100644
--- a/chrome/browser/predictors/autocomplete_action_predictor.cc
+++ b/chrome/browser/predictors/autocomplete_action_predictor.cc
@@ -26,6 +26,7 @@
 #include "chrome/browser/predictors/predictor_database.h"
 #include "chrome/browser/predictors/predictor_database_factory.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
+#include "chrome/browser/prerender/prerender_handle.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ -153,6 +154,20 @@ void AutocompleteActionPredictor::ClearTransitionalMatches() {
   transitional_matches_.clear();
 }
 
+void AutocompleteActionPredictor::StartPrerendering(
+    const GURL& url,
+    content::SessionStorageNamespace* session_storage_namespace,
+    gfx::Size size) {
+  if (prerender::PrerenderManager* prerender_manager =
+          prerender::PrerenderManagerFactory::GetForProfile(profile_)) {
+    prerender_handle_.reset(
+        prerender_manager->AddPrerenderFromOmnibox(
+            url, session_storage_namespace, size));
+  } else {
+    prerender_handle_.reset();
+  }
+}
+
 // Given a match, return a recommended action.
 AutocompleteActionPredictor::Action
     AutocompleteActionPredictor::RecommendAction(
@@ -308,6 +323,10 @@ void AutocompleteActionPredictor::OnOmniboxOpenedUrl(
       prerender::IsOmniboxEnabled(profile_));
 
   const GURL& opened_url = match.destination_url;
+
+  prerender_handle_->OnNavigateAway();

[dominich, 2012/07/02 20:43:03]

I know that OnNavigateAway doesn't immediately delete the prerender, but that's
an implementation detail. I'd much rather we call this iff we don't have a URL
match. Or not call it at all.

[gavinp, 2012/07/03 16:41:02]

Done. I'll add it back when prerenders become long lived.

+  prerender_handle_.reset();
+
   const string16 lower_user_text(base::i18n::ToLower(log.text));
 
   // Traverse transitional matches for those that have a user_text that is a