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..8f5e46d999f0fcd8c9d066a94118e41751561c26 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 +154,19 @@ void AutocompleteActionPredictor::ClearTransitionalMatches() {
   transitional_matches_.clear();
 }
 
+void AutocompleteActionPredictor::StartPrerendering(
+    const GURL& url,
+    content::SessionStorageNamespace* session_storage_namespace,
+    gfx::Size size) {
+  if (prerender_handle_)
+    prerender_handle_->Release();
+  if (prerender::PrerenderManager* prerender_manager =
+          prerender::PrerenderManagerFactory::GetForProfile(profile_)) {
+    prerender_handle_ = prerender_manager->AddPrerenderFromOmnibox(
+        url, session_storage_namespace, size);
+  }
+}
+
 // Given a match, return a recommended action.
 AutocompleteActionPredictor::Action
     AutocompleteActionPredictor::RecommendAction(
@@ -308,6 +322,12 @@ void AutocompleteActionPredictor::OnOmniboxOpenedUrl(
       prerender::IsOmniboxEnabled(profile_));
 
   const GURL& opened_url = match.destination_url;
+
+  // TODO(gavinp,dominich): When we add proper abandonment semantics to
+  // prerenders, we should mark the prerender_ as abandoned here, so that it
+  // won't live the full expiry period.

[dominich, 2012/06/28 00:34:32]

the opened_url might match something in the redirect chain (ie, the alias urls)
so do we really want to mark it as abandoned?

+  // See: http://code.google.com/p/chromium/issues/detail?id=134268
+
   const string16 lower_user_text(base::i18n::ToLower(log.text));
 
   // Traverse transitional matches for those that have a user_text that is a