Handle interface to prerenders.

chrome/browser/predictors/autocomplete_action_predictor.h

Index: chrome/browser/predictors/autocomplete_action_predictor.h
diff --git a/chrome/browser/predictors/autocomplete_action_predictor.h b/chrome/browser/predictors/autocomplete_action_predictor.h
index afbba8354ca71bd138c8fd5d4b3a71a8e2c5abe4..d1ac1082baddcb7fe0fa49e1f8216892f9945b85 100644
--- a/chrome/browser/predictors/autocomplete_action_predictor.h
+++ b/chrome/browser/predictors/autocomplete_action_predictor.h
@@ -10,6 +10,7 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/string16.h"
 #include "chrome/browser/history/history_types.h"
@@ -18,6 +19,7 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "googleurl/src/gurl.h"
+#include "ui/gfx/size.h"
 
 struct AutocompleteLog;
 struct AutocompleteMatch;
@@ -26,10 +28,18 @@ class HistoryService;
 class PredictorsHandler;
 class Profile;
 
+namespace content {
+  class SessionStorageNamespace;
+}
+
 namespace history {
 class URLDatabase;
 }
 
+namespace prerender {
+class PrerenderHandle;
+}
+
 namespace predictors {
 
 // This class is responsible for determining the correct predictive network
@@ -79,6 +89,15 @@ class AutocompleteActionPredictor
   Action RecommendAction(const string16& user_text,
                          const AutocompleteMatch& match) const;
 
+  // Begin prerendering |url| with |session_storage_namespace|. The |size| gives
+  // the initial size for the target prerender. The predictor will run at most
+  // one prerender at a time, so launching a prerender will cancel our previous
+  // prerenders (if any).
+  void StartPrerendering(
+      const GURL& url,
+      content::SessionStorageNamespace* session_storage_namespace,
+      gfx::Size size);
+
   // Return true if the suggestion type warrants a TCP/IP preconnection.
   // i.e., it is now quite likely that the user will select the related domain.
   static bool IsPreconnectable(const AutocompleteMatch& match);
@@ -199,6 +218,8 @@ class AutocompleteActionPredictor
   // This is cleared after every Omnibox navigation.
   std::vector<TransitionalMatch> transitional_matches_;
 
+  scoped_ptr<prerender::PrerenderHandle> prerender_handle_;
+
   // This allows us to predict the effect of confidence threshold changes on
   // accuracy.  This is cleared after every omnibox navigation.
   mutable std::vector<std::pair<GURL, double> > tracked_urls_;