Prefetch high-confidence search suggestions in Android Chrome.

chrome/browser/android/omnibox/omnibox_prerender.cc

Index: chrome/browser/android/omnibox/omnibox_prerender.cc
diff --git a/chrome/browser/android/omnibox/omnibox_prerender.cc b/chrome/browser/android/omnibox/omnibox_prerender.cc
index 67bb950cedfb194bb87d9896f16044928b0165c8..c3916c5003d32e64fcd42ec38818d0c287b5d475 100644
--- a/chrome/browser/android/omnibox/omnibox_prerender.cc
+++ b/chrome/browser/android/omnibox/omnibox_prerender.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/predictors/autocomplete_action_predictor_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_android.h"
+#include "chrome/browser/ui/search/instant_search_prerenderer.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/OmniboxPrerender_jni.h"
 #include "url/gurl.h"
@@ -88,18 +89,25 @@ void OmniboxPrerender::PrerenderMaybe(JNIEnv* env,
   if (default_match == autocomplete_result->end())
     return;
 
-  AutocompleteActionPredictor* action_predictor =
-      AutocompleteActionPredictorFactory::GetForProfile(profile);
-  if (!action_predictor)
-    return;
-
   AutocompleteActionPredictor::Action recommended_action =
       AutocompleteActionPredictor::ACTION_NONE;
-  if (action_predictor) {
-    action_predictor->
-        RegisterTransitionalMatches(url_string, *autocomplete_result);
-    recommended_action =
-        action_predictor->RecommendAction(url_string, *default_match);
+  InstantSearchPrerenderer* prerenderer =
+      InstantSearchPrerenderer::GetForProfile(profile);
+  if (prerenderer &&
+      prerenderer->IsAllowed(*default_match, web_contents)) {
+    recommended_action = AutocompleteActionPredictor::ACTION_PRERENDER;
+  } else {
+    AutocompleteActionPredictor* action_predictor =
+        AutocompleteActionPredictorFactory::GetForProfile(profile);
+    if (!action_predictor)
+      return;
+
+    if (action_predictor) {
+      action_predictor->
+          RegisterTransitionalMatches(url_string, *autocomplete_result);
+      recommended_action =
+          action_predictor->RecommendAction(url_string, *default_match);
+    }
   }
 
   GURL current_url = GURL(current_url_string);
@@ -135,6 +143,14 @@ void OmniboxPrerender::DoPrerender(const AutocompleteMatch& match,
   if (!web_contents)
     return;
   gfx::Rect container_bounds = web_contents->GetContainerBounds();
+  InstantSearchPrerenderer* prerenderer =
+      InstantSearchPrerenderer::GetForProfile(profile);
+  if (prerenderer && prerenderer->IsAllowed(match, web_contents)) {
+    prerenderer->Init(
+        web_contents->GetController().GetSessionStorageNamespaceMap(),
+        container_bounds.size());
+    return;
+  }
   predictors::AutocompleteActionPredictorFactory::GetForProfile(profile)->
       StartPrerendering(
           match.destination_url,