Add core plumbing for Instant Extended work

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 9e3fdc5a78ce0ab551a603950e19e178a23bf904..19832cbb2a24930abe11dd27b7531888da819644 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -119,6 +119,9 @@
 #include "chrome/browser/ui/omnibox/location_bar.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
+#include "chrome/browser/ui/search/search.h"
+#include "chrome/browser/ui/search/search_delegate.h"
+#include "chrome/browser/ui/search/search_model.h"
 #include "chrome/browser/ui/search_engines/search_engine_tab_helper.h"
 #include "chrome/browser/ui/status_bubble.h"
 #include "chrome/browser/ui/sync/browser_synced_window_delegate.h"
@@ -374,6 +377,9 @@ Browser::Browser(Type type, Profile* profile)
   tab_strip_model_->AddObserver(this);
 
   toolbar_model_.reset(new ToolbarModel(toolbar_model_delegate_.get()));
+  search_model_.reset(new chrome::search::SearchModel(NULL));
+  search_delegate_.reset(
+      new chrome::search::SearchDelegate(search_model_.get()));
 
   registrar_.Add(this, content::NOTIFICATION_SSL_VISIBLE_STATE_CHANGED,
                  content::NotificationService::AllSources());
@@ -2848,6 +2854,8 @@ void Browser::TabDetachedAt(TabContents* contents, int index) {
 
 void Browser::TabDeactivated(TabContents* contents) {
   fullscreen_controller_->OnTabDeactivated(contents);
+  search_delegate_->OnTabDeactivated(contents);
+
   if (instant())
     instant()->Hide();
 
@@ -2892,6 +2900,9 @@ void Browser::ActiveTabChanged(TabContents* old_contents,
   // Propagate the profile to the location bar.
   UpdateToolbar(true);
 
+  // Propagate tab state to toolbar, tab-strip, etc.
+  UpdateSearchState(new_contents);
+
   // Update reload/stop state.
   UpdateReloadStopState(new_contents->web_contents()->IsLoading(), true);
 
@@ -4425,6 +4436,11 @@ void Browser::UpdateToolbar(bool should_restore_state) {
   window_->UpdateToolbar(GetActiveTabContents(), should_restore_state);
 }
 
+void Browser::UpdateSearchState(TabContents* contents) {
+  if (chrome::search::IsInstantExtendedAPIEnabled(profile_))
+    search_delegate_->OnTabActivated(contents);
+}
+
 void Browser::ScheduleUIUpdate(const WebContents* source,
                                unsigned changed_flags) {
   if (!source)
@@ -4787,6 +4803,9 @@ void Browser::TabDetachedAtImpl(TabContents* contents, int index,
     ClearUnloadState(contents->web_contents(), false);
   }
 
+  // Stop observing search model changes for this tab.
+  search_delegate_->OnTabDetached(contents);
+
   registrar_.Remove(this, content::NOTIFICATION_INTERSTITIAL_ATTACHED,
                     content::Source<WebContents>(contents->web_contents()));
   registrar_.Remove(this, content::NOTIFICATION_INTERSTITIAL_DETACHED,