Prerender Instant search base url on omnibox focus event

chrome/browser/ui/search/search_tab_helper.cc

 // Copyright 2012 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 "chrome/browser/ui/search/search_tab_helper.h"
 
 #include <set>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/history/most_visited_tiles_experiment.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/instant_service.h"
 #include "chrome/browser/search/instant_service_factory.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/ui/app_list/app_list_util.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/omnibox/location_bar.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
 #include "chrome/browser/ui/omnibox/omnibox_popup_model.h"
 #include "chrome/browser/ui/omnibox/omnibox_view.h"
+#include "chrome/browser/ui/search/instant_search_prerenderer.h"
 #include "chrome/browser/ui/search/search_ipc_router_policy_impl.h"
 #include "chrome/browser/ui/search/search_tab_helper_delegate.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 #include "chrome/browser/ui/webui/ntp/ntp_user_data_logger.h"
 #include "chrome/common/url_constants.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/navigation_type.h"
@@ skipping 127 matching lines @@
       content::Source<SearchTabHelper>(this),
       content::NotificationService::NoDetails());
 
   ipc_router_.OmniboxFocusChanged(state, reason);
 
   // Don't send oninputstart/oninputend updates in response to focus changes
   // if there's a navigation in progress. This prevents Chrome from sending
   // a spurious oninputend when the user accepts a match in the omnibox.
   if (web_contents_->GetController().GetPendingEntry() == NULL) {
     ipc_router_.SetInputInProgress(IsInputInProgress());
+
+    InstantSearchPrerenderer* prerenderer =
+        InstantSearchPrerenderer::GetForProfile(profile());
+    if (!prerenderer || !chrome::ShouldPrerenderInstantUrlOnOmniboxFocus())
+      return;
+
+    if (state == OMNIBOX_FOCUS_NONE) {
+      prerenderer->Cancel();
+      return;
+    }
+
+    if (!IsSearchResultsPage()) {
+      prerenderer->Init(
+          web_contents_->GetController().GetSessionStorageNamespaceMap(),
+          web_contents_->GetContainerBounds().size());
+    }
   }
 }
 
 void SearchTabHelper::NavigationEntryUpdated() {
   if (!is_search_enabled_)
     return;
 
   UpdateMode(false, false);
 }
 
@@ skipping 23 matching lines @@
     const InstantSuggestion& suggestion) {
   ipc_router_.SetSuggestionToPrefetch(suggestion);
 }
 
 void SearchTabHelper::Submit(const base::string16& text) {
   ipc_router_.Submit(text);
 }
 
 void SearchTabHelper::OnTabActivated() {
   ipc_router_.OnTabActivated();
+
+  OmniboxView* omnibox_view = GetOmniboxView();
+  if (chrome::ShouldPrerenderInstantUrlOnOmniboxFocus() && omnibox_view &&
+      omnibox_view->model()->has_focus()) {
+    InstantSearchPrerenderer* prerenderer =
+        InstantSearchPrerenderer::GetForProfile(profile());
+    if (prerenderer && !IsSearchResultsPage()) {
+      prerenderer->Init(
+          web_contents_->GetController().GetSessionStorageNamespaceMap(),
+          web_contents_->GetContainerBounds().size());
+    }
+  }
 }
 
 void SearchTabHelper::OnTabDeactivated() {
   ipc_router_.OnTabDeactivated();
 }
 
 void SearchTabHelper::ToggleVoiceSearch() {
   ipc_router_.ToggleVoiceSearch();
 }
 
@@ skipping 360 matching lines @@
 
 bool SearchTabHelper::IsInputInProgress() const {
   OmniboxView* omnibox = GetOmniboxView();
   return !model_.mode().is_ntp() && omnibox &&
       omnibox->model()->focus_state() == OMNIBOX_FOCUS_VISIBLE;
 }
 
 OmniboxView* SearchTabHelper::GetOmniboxView() const {
   return delegate_ ? delegate_->GetOmniboxView() : NULL;
 }