Reload Instant NTP and Instant-process tabs on search url change

chrome/browser/search/instant_service.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 "chrome/browser/search/instant_service.h"
 
 #include <vector>
 
 #include "base/logging.h"
+#include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "chrome/browser/history/most_visited_tiles_experiment.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/instant_io_context.h"
 #include "chrome/browser/search/instant_service_factory.h"
 #include "chrome/browser/search/instant_service_observer.h"
 #include "chrome/browser/search/local_ntp_source.h"
 #include "chrome/browser/search/most_visited_iframe_source.h"
 #include "chrome/browser/search/search.h"
+#include "chrome/browser/search_engines/template_url.h"
+#include "chrome/browser/search_engines/template_url_service.h"
+#include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/webui/favicon_source.h"
 #include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
 #include "chrome/browser/ui/webui/theme_source.h"
+#include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/url_data_source.h"
 #include "grit/theme_resources.h"
+#include "net/base/net_util.h"
 #include "net/url_request/url_request.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/sys_color_change_listener.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
 
 namespace {
 
@@ skipping 39 matching lines @@
                    profile->GetResourceContext(), instant_io_context_));
   }
 
   // Set up the data sources that Instant uses on the NTP.
 #if defined(ENABLE_THEMES)
   // Listen for theme installation.
   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
                  content::Source<ThemeService>(
                      ThemeServiceFactory::GetForProfile(profile_)));
 
-  content::URLDataSource::Add(profile, new ThemeSource(profile));
+  content::URLDataSource::Add(profile_, new ThemeSource(profile_));
 #endif  // defined(ENABLE_THEMES)
 
-  content::URLDataSource::Add(profile, new ThumbnailSource(profile));
-  content::URLDataSource::Add(profile, new FaviconSource(
-      profile, FaviconSource::FAVICON));
-  content::URLDataSource::Add(profile, new LocalNtpSource(profile));
-  content::URLDataSource::Add(profile, new MostVisitedIframeSource());
+  registrar_.Add(this, chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
+                 content::Source<Profile>(profile_->GetOriginalProfile()));
+
   registrar_.Add(this, chrome::NOTIFICATION_PROFILE_DESTROYED,
                  content::Source<Profile>(profile_));
+
+  content::URLDataSource::Add(profile_, new ThumbnailSource(profile_));
+  content::URLDataSource::Add(
+      profile_, new FaviconSource(profile_, FaviconSource::FAVICON));
+  content::URLDataSource::Add(profile_, new LocalNtpSource(profile_));
+  content::URLDataSource::Add(profile_, new MostVisitedIframeSource());
+
+  profile_pref_registrar_.Init(profile_->GetPrefs());
+  profile_pref_registrar_.Add(
+      prefs::kDefaultSearchProviderID,
+      base::Bind(&InstantService::OnDefaultSearchProviderChanged,
+                 base::Unretained(this)));
 }
 
 InstantService::~InstantService() {
 }
 
 void InstantService::AddInstantProcess(int process_id) {
   process_ids_.insert(process_id);
 
   if (instant_io_context_.get()) {
     BrowserThread::PostTask(BrowserThread::IO,
@@ skipping 74 matching lines @@
   return ntp_prerenderer_.GetNTPContents();
 }
 
 void InstantService::OnBrowserInstantControllerCreated() {
   if (profile_->IsOffTheRecord())
     return;
 
   ++browser_instant_controller_object_count_;
 
   if (browser_instant_controller_object_count_ == 1)
-    ntp_prerenderer_.PreloadInstantNTP();
+    ntp_prerenderer_.Init();
 }
 
 void InstantService::OnBrowserInstantControllerDestroyed() {
   if (profile_->IsOffTheRecord())
     return;
 
   DCHECK_GT(browser_instant_controller_object_count_, 0U);
   --browser_instant_controller_object_count_;
 
   // All browser windows have closed, so release the InstantNTP resources to
   // work around http://crbug.com/180810.
   if (browser_instant_controller_object_count_ == 0)
-    ntp_prerenderer_.DeleteNTPContents();
+    ntp_prerenderer_.Destroy();

[samarth, 2013/08/14 00:24:14]

Init -> InitNTP or PreloadNTP
Destroy -> DestroyNTP or DeleteNTP

[Anuj, 2013/08/14 06:38:57]

Reverted those methods.

 }
 
 void InstantService::Observe(int type,
                              const content::NotificationSource& source,
                              const content::NotificationDetails& details) {
   switch (type) {
     case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED: {
       int process_id =
           content::Source<content::RenderProcessHost>(source)->GetID();
       process_ids_.erase(process_id);
@@ skipping 26 matching lines @@
     case chrome::NOTIFICATION_PROFILE_DESTROYED: {
       // Last chance to delete InstantNTP contents. We generally delete
       // preloaded InstantNTP when the last BrowserInstantController object is
       // destroyed. When the browser shutdown happens without closing browsers,
       // there is a race condition between BrowserInstantController destruction
       // and Profile destruction.
       if (GetNTPContents())
         ntp_prerenderer_.DeleteNTPContents();
       break;
     }
+    case chrome::NOTIFICATION_GOOGLE_URL_UPDATED: {

[samarth, 2013/08/14 00:24:14]

Does this ever fire if google is not your default search provider? If so, you
may want to add a check for that. Otherwise, all the reloads are pointless.

[Anuj, 2013/08/14 06:38:57]

It is guarded by presence of GogoleBaseURLs in default search provider.

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/goo...

+      OnGoogleURLUpdated(
+          content::Source<Profile>(source).ptr(),
+          content::Details<GoogleURLTracker::UpdatedDetails>(details).ptr());
+      break;
+    }
     default:
       NOTREACHED() << "Unexpected notification type in InstantService.";
   }
 }
 
 void InstantService::OnMostVisitedItemsReceived(
     const history::MostVisitedURLList& data) {
   history::MostVisitedURLList reordered_data(data);
   history::MostVisitedTilesExperiment::MaybeShuffle(&reordered_data);
 
@@ skipping 121 matching lines @@
     theme_info_->image_height = image->height();
 
     theme_info_->has_attribution =
        theme_service->HasCustomImage(IDR_THEME_NTP_ATTRIBUTION);
   }
 
   FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
                     ThemeInfoChanged(*theme_info_));
 }
 
+void InstantService::OnGoogleURLUpdated(
+    Profile* profile,
+    GoogleURLTracker::UpdatedDetails* details) {
+  GURL last_prompted_url(
+      profile->GetPrefs()->GetString(prefs::kLastPromptedGoogleURL));
+
+  // See GoogleURLTracker::OnURLFetchComplete.
+  // last_prompted_url.is_empty indicated very first run of Chrome. So there is
+  // no need to tamper with Instant resources.
+  if (last_prompted_url.is_empty())
+    return;
+
+  // Only the scheme changed. Ignore it since we do not prompt the user in this
+  // case.
+  if (net::StripWWWFromHost(details->first) ==
+      net::StripWWWFromHost(details->second))
+    return;
+
+  FOR_EACH_OBSERVER(InstantServiceObserver, observers_, GoogleURLUpdated());
+}
+
+void InstantService::OnDefaultSearchProviderChanged(
+    const std::string& pref_name) {
+  DCHECK_EQ(pref_name, std::string(prefs::kDefaultSearchProviderID));
+  const TemplateURL* template_url = TemplateURLServiceFactory::GetForProfile(
+      profile_)->GetDefaultSearchProvider();
+  if (!template_url) {
+    // A NULL |template_url| could mean either this notification is sent during
+    // the browser start up operation or the user now has no default search
+    // provider. There is no way for the user to reach this state using the
+    // Chrome settings. Only explicitly poking at the DB or bugs in the Sync
+    // could cause that, neither of which we support.
+    return;
+  }
+  FOR_EACH_OBSERVER(
+      InstantServiceObserver, observers_, DefaultSearchProviderChanged());
+}
+
 InstantNTPPrerenderer* InstantService::ntp_prerenderer() {
   return &ntp_prerenderer_;
 }