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 128 matching lines @@
       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());
   }
+
+  if (chrome::ShouldPrerenderInstantUrlOnOmniboxFocus()) {
+    InstantSearchPrerenderer* prerenderer =
+        InstantSearchPrerenderer::GetForProfile(profile());
+    if (prerenderer) {
+      if (state != OMNIBOX_FOCUS_NONE) {

[kmadhusu, 2014/06/18 16:23:50]

nit: For better readability, can we split this if-blocks as follows:

if (!prerenderer)
  return;

if (state == OMNIBOX_FOCUS_NONE) {
  prerenderer->Cancel();
  return;
}

if (!IsSearchResultsPage())
  Init();

[sidharthms, 2014/06/19 20:36:52]

Done.

+        if (!IsSearchResultsPage())
+          prerenderer->Init(
+              web_contents_->GetController().GetSessionStorageNamespaceMap(),
+              web_contents_->GetContainerBounds().size());
+      } else {
+        prerenderer->Cancel();
+      }
+    }
+  }
 }
 
 void SearchTabHelper::NavigationEntryUpdated() {
   if (!is_search_enabled_)
     return;
 
   UpdateMode(false, false);
 }
 
 void SearchTabHelper::InstantSupportChanged(bool instant_support) {
@@ skipping 22 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();
+
+  if (chrome::ShouldPrerenderInstantUrlOnOmniboxFocus() &&
+      GetOmniboxView()->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;
 }