Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/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/instant/instant_service.h"
 
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/instant/instant_io_context.h"
+#include "chrome/browser/instant/instant_preloader.h"
+#include "chrome/browser/instant/search.h"
 #include "chrome/browser/profiles/profile.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/ntp/thumbnail_source.h"
 #include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
-#include "content/public/browser/url_data_source.h"
-
-using content::BrowserThread;
+#include "grit/theme_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/sys_color_change_listener.h"
+
+namespace {
+
+const size_t kMaxDebugEvents = 2000;
+
+}  // namespace
 
 InstantService::InstantService(Profile* profile)
-    : profile_(profile) {
+    : profile_(profile),
+      omnibox_font_size_(0),
+      omnibox_start_margin_(0),
+      instant_pref_enabled_(false),
+      instant_enabled_(false) {
   // Stub for unit tests.

[samarth, 2013/03/11 19:03:24]

Makes me slightly nervous. How about wrapping this in a #ifdef UNIT_TEST

-  if (!BrowserThread::CurrentlyOn(BrowserThread::UI))
+  if (!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI))
     return;
 
-  registrar_.Add(this,
-                 content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
-                 content::NotificationService::AllSources());
-
-  instant_io_context_ = new InstantIOContext();
-
-  if (profile_ && profile_->GetResourceContext()) {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
+  notification_registrar_.Add(this,
+                              content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
+                              content::NotificationService::AllSources());
+
+  io_context_ = new InstantIOContext();
+
+  if (profile && profile->GetResourceContext()) {
+    content::BrowserThread::PostTask(
+        content::BrowserThread::IO, FROM_HERE,
         base::Bind(&InstantIOContext::SetUserDataOnIO,
-                   profile->GetResourceContext(), instant_io_context_));
+                   profile->GetResourceContext(), io_context_));
   }
 
   content::URLDataSource::Add(profile, new ThumbnailSource(profile));
+
+  // In one mode of the InstantExtended experiments, the kInstantExtendedEnabled
+  // preference's default value is set to the existing value of kInstantEnabled.
+  // Because this requires reading the value of the kInstantEnabled value, we
+  // reset the default for kInstantExtendedEnabled here.
+  chrome::search::SetInstantExtendedPrefDefault(profile);
+
+  pref_change_registrar_.Init(profile->GetPrefs());
+  pref_change_registrar_.Add(
+      prefs::kInstantEnabled,
+      base::Bind(&InstantService::PrefChanged, base::Unretained(this)));
+  pref_change_registrar_.Add(
+      prefs::kInstantExtendedEnabled,
+      base::Bind(&InstantService::PrefChanged, base::Unretained(this)));
+  pref_change_registrar_.Add(
+      prefs::kSearchSuggestEnabled,
+      base::Bind(&InstantService::PrefChanged, base::Unretained(this)));
+  PrefChanged(std::string());
+
+  ThemeService* theme_service = ThemeServiceFactory::GetForProfile(profile);
+  notification_registrar_.Add(this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
+                              content::Source<ThemeService>(theme_service));
+  ParseTheme(theme_service);
+
+  history::TopSites* top_sites = profile->GetTopSites();
+  notification_registrar_.Add(this, chrome::NOTIFICATION_TOP_SITES_CHANGED,
+                              content::Source<history::TopSites>(top_sites));
+  RequestMostVisitedItems(top_sites);
+
+// TODO(sail): Remove this once the Mac omnibox font size is updated.
+#if defined(OS_MACOSX)
+  ui::ResourceBundle::FontStyle font_style = ui::ResourceBundle::BaseFont;
+#else
+  ui::ResourceBundle::FontStyle font_style = ui::ResourceBundle::MediumFont;
+#endif  // defined(OS_MACOSX)
+  const gfx::Font& omnibox_font =
+      ui::ResourceBundle::GetSharedInstance().GetFont(font_style);
+  omnibox_font_name_ = UTF8ToUTF16(omnibox_font.GetFontName());
+  omnibox_font_size_ = omnibox_font.GetFontSize();
 }
 
 InstantService::~InstantService() {
 }
 
+void InstantService::LogDebugEvent(const std::string& message) {
+  DVLOG(1) << message;
+  debug_events_.push_front(std::make_pair(base::Time::Now().ToInternalValue(),
+                                          message));
+  if (debug_events_.size() > kMaxDebugEvents)
+    debug_events_.pop_back();
+}
+
+void InstantService::ClearDebugEvents() {
+  debug_events_.clear();
+}
+
+void InstantService::AddObserver(InstantServiceObserver* observer) {
+  observers_.AddObserver(observer);
+
+  // If we just added our first observer, we have our first browser window.

[samarth, 2013/03/11 19:03:24]

This seems too subtle and easy to go wrong. I'd prefer a more explicit signal
that we should start preloading.

Can we explicitly listen for a window being opened? (And we can skip preloading
if a InstantPreloader already exists.)

+  // Create the InstantPreloader (which will also register as an observer).
+  if (observers_.size() == 1)
+    preloader_.reset(new InstantPreloader(this));
+}
+
+void InstantService::RemoveObserver(InstantServiceObserver* observer) {
+  observers_.RemoveObserver(observer);
+
+  // If there's only one observer left, it must be the InstantPreloader. All

[samarth, 2013/03/11 19:03:24]

Again, I'd prefer a more explicit signal if possible.

+  // browser windows have closed, so kill the preloader, to work around
+  // http://crbug.com/180810.
+  if (observers_.size() == 1)
+    preloader_.reset();
+}
+
+bool InstantService::IsInstantProcess(int process_id) const {
+  return process_ids_.find(process_id) != process_ids_.end();
+}
+
 void InstantService::AddInstantProcess(int process_id) {
   process_ids_.insert(process_id);
 
-  if (instant_io_context_) {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
+  if (io_context_) {
+    content::BrowserThread::PostTask(
+        content::BrowserThread::IO, FROM_HERE,
         base::Bind(&InstantIOContext::AddInstantProcessOnIO,
-                   instant_io_context_, process_id));
-  }
-}
-
-bool InstantService::IsInstantProcess(int process_id) const {
-  return process_ids_.find(process_id) != process_ids_.end();
-}
-
-void InstantService::Shutdown() {
-  process_ids_.clear();
-
-  if (instant_io_context_) {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&InstantIOContext::ClearInstantProcessesOnIO,
-                   instant_io_context_));
-  }
-  instant_io_context_ = NULL;
+                   io_context_, process_id));
+  }
+}
+
+void InstantService::RemoveInstantProcess(int process_id) {
+  process_ids_.erase(process_id);
+
+  if (io_context_) {
+    content::BrowserThread::PostTask(
+        content::BrowserThread::IO, FROM_HERE,
+        base::Bind(&InstantIOContext::RemoveInstantProcessOnIO,
+                   io_context_, process_id));
+  }
+}
+
+void InstantService::InstantSupportDetermined() {
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_INSTANT_SUPPORT_DETERMINED,
+      content::NotificationService::AllSources(),
+      content::NotificationService::NoDetails());
 }
 
 void InstantService::Observe(int type,
                              const content::NotificationSource& source,
                              const content::NotificationDetails& details) {
-  DCHECK_EQ(type, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED);
-  int process_id = content::Source<content::RenderProcessHost>(source)->GetID();
-  process_ids_.erase(process_id);
-
-  if (instant_io_context_) {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&InstantIOContext::RemoveInstantProcessOnIO,
-                   instant_io_context_, process_id));
-  }
-}
+  switch (type) {
+    case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED:
+      RemoveInstantProcess(
+          content::Source<content::RenderProcessHost>(source)->GetID());
+      break;
+
+    case chrome::NOTIFICATION_BROWSER_THEME_CHANGED:
+      ParseTheme(content::Source<ThemeService>(source).ptr());
+      break;
+
+    case chrome::NOTIFICATION_TOP_SITES_CHANGED:
+      RequestMostVisitedItems(content::Source<history::TopSites>(source).ptr());
+      break;
+
+    default:
+      NOTREACHED();
+      break;
+  }
+}
+
+void InstantService::PrefChanged(const std::string& pref_name) {
+  if (pref_name == prefs::kInstantEnabled)

[samarth, 2013/03/11 19:03:24]

I'm a little confused why you reset some of the prefs always and only reset this
one if the pref_name matches. Can you comment with what is going on here?

+    chrome::search::SetInstantExtendedPrefDefault(profile_);
+
+  bool instant_pref_enabled = chrome::search::IsInstantPrefEnabled(profile_);
+  bool instant_enabled = chrome::search::IsInstantEnabled(profile_);
+  if (instant_pref_enabled_ == instant_pref_enabled &&
+      instant_enabled_ == instant_enabled)
+    return;
+
+  instant_pref_enabled_ = instant_pref_enabled;
+  instant_enabled_ = instant_enabled;
+  FOR_EACH_OBSERVER(InstantServiceObserver, observers_, InstantStatusChanged());
+}
+
+void InstantService::ParseTheme(ThemeService* theme_service) {
+  theme_info_ = ThemeBackgroundInfo();
+
+  // Set theme background color.
+  SkColor background_color =
+      theme_service->GetColor(ThemeProperties::COLOR_NTP_BACKGROUND);
+  if (gfx::IsInvertedColorScheme())
+    background_color = color_utils::InvertColor(background_color);
+  theme_info_.color_r = SkColorGetR(background_color);
+  theme_info_.color_g = SkColorGetG(background_color);
+  theme_info_.color_b = SkColorGetB(background_color);
+  theme_info_.color_a = SkColorGetA(background_color);
+
+  if (!theme_service->HasCustomImage(IDR_THEME_NTP_BACKGROUND))
+    return;
+
+  // Set theme id for theme background image url.
+  theme_info_.theme_id = UTF8ToUTF16(theme_service->GetThemeID());
+
+  // Set theme background image horizontal alignment.
+  int alignment = 0;
+  theme_service->GetDisplayProperty(ThemeProperties::NTP_BACKGROUND_ALIGNMENT,
+                                    &alignment);
+  if (alignment & ThemeProperties::ALIGN_LEFT) {

[samarth, 2013/03/11 19:03:24]

nit: no braces?  (not sure if Chromium makes an exception for  if/else if/elses)

+    theme_info_.image_horizontal_alignment = THEME_BKGRND_IMAGE_ALIGN_LEFT;
+  } else if (alignment & ThemeProperties::ALIGN_RIGHT) {
+    theme_info_.image_horizontal_alignment = THEME_BKGRND_IMAGE_ALIGN_RIGHT;
+  } else {  // ALIGN_CENTER
+    theme_info_.image_horizontal_alignment = THEME_BKGRND_IMAGE_ALIGN_CENTER;
+  }
+
+  // Set theme background image vertical alignment.
+  if (alignment & ThemeProperties::ALIGN_TOP) {
+    theme_info_.image_vertical_alignment = THEME_BKGRND_IMAGE_ALIGN_TOP;
+  } else if (alignment & ThemeProperties::ALIGN_BOTTOM) {
+    theme_info_.image_vertical_alignment = THEME_BKGRND_IMAGE_ALIGN_BOTTOM;
+  } else {  // ALIGN_CENTER
+    theme_info_.image_vertical_alignment = THEME_BKGRND_IMAGE_ALIGN_CENTER;
+  }
+
+  // Set theme background image tiling.
+  int tiling = 0;
+  theme_service->GetDisplayProperty(ThemeProperties::NTP_BACKGROUND_TILING,
+                                    &tiling);
+  switch (tiling) {
+    case ThemeProperties::NO_REPEAT:
+        theme_info_.image_tiling = THEME_BKGRND_IMAGE_NO_REPEAT;

[samarth, 2013/03/11 19:03:24]

Indent looks wrong

+        break;
+    case ThemeProperties::REPEAT_X:
+        theme_info_.image_tiling = THEME_BKGRND_IMAGE_REPEAT_X;
+        break;
+    case ThemeProperties::REPEAT_Y:
+        theme_info_.image_tiling = THEME_BKGRND_IMAGE_REPEAT_Y;
+        break;
+    case ThemeProperties::REPEAT:
+        theme_info_.image_tiling = THEME_BKGRND_IMAGE_REPEAT;
+        break;
+  }
+
+  // Set theme background image height.
+  gfx::ImageSkia* image = theme_service->GetImageSkiaNamed(
+      IDR_THEME_NTP_BACKGROUND);
+  DCHECK(image);
+  theme_info_.image_height = image->height();
+
+  FOR_EACH_OBSERVER(InstantServiceObserver, observers_, ThemeInfoChanged());
+}
+
+void InstantService::RequestMostVisitedItems(history::TopSites* top_sites) {
+  top_sites->GetMostVisitedURLs(
+      base::Bind(&InstantService::MostVisitedItemsReceived,
+                 base::Unretained(this)));
+}
+
+void InstantService::MostVisitedItemsReceived(
+    const history::MostVisitedURLList& data) {
+  most_visited_items_.clear();
+  for (size_t i = 0; i < data.size(); ++i)
+    most_visited_items_.push_back(MostVisitedItem(data[i].url, data[i].title));
+
+  FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
+                    MostVisitedItemsChanged());
+}