Prefetch high-confidence search suggestions in Android Chrome.

chrome/browser/android/omnibox/omnibox_prerender.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "omnibox_prerender.h"
 
 #include "base/android/jni_string.h"
 #include "base/logging.h"
 #include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/autocomplete_result.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor.h"
 #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"
 
 using predictors::AutocompleteActionPredictor;
 using predictors::AutocompleteActionPredictorFactory;
 
 OmniboxPrerender::OmniboxPrerender(JNIEnv* env, jobject obj)
     : weak_java_omnibox_(env, obj) {
 }
@@ skipping 55 matching lines @@
   if (!autocomplete_result)
     return;
   if (!profile)
     return;
 
   const AutocompleteResult::const_iterator default_match(
       autocomplete_result->default_match());
   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);
   switch (recommended_action) {
     case AutocompleteActionPredictor::ACTION_PRERENDER:
       // Ask for prerendering if the destination URL is different than the
       // current URL.
       if (default_match->destination_url != current_url) {
         DoPrerender(
             *default_match,
@@ skipping 15 matching lines @@
 void OmniboxPrerender::DoPrerender(const AutocompleteMatch& match,
                                    Profile* profile,
                                    content::WebContents* web_contents) {
   DCHECK(profile);
   if (!profile)
     return;
   DCHECK(web_contents);
   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,
           web_contents->GetController().GetSessionStorageNamespaceMap(),
           container_bounds.size());
 }