Support Component Actions in the toolbar.

chrome/browser/ui/toolbar/toolbar_actions_model.cc

 // Copyright (c) 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/extensions/extension_toolbar_model.h"
+#include "chrome/browser/ui/toolbar/toolbar_actions_model.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/location.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_base.h"
 #include "base/prefs/pref_service.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/extensions/api/extension_action/extension_action_api.h"
 #include "chrome/browser/extensions/extension_action_manager.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
-#include "chrome/browser/extensions/extension_toolbar_model_factory.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/extensions/extension_action_view_controller.h"
 #include "chrome/browser/ui/extensions/extension_toolbar_icon_surfacing_bubble_delegate.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/toolbar/component_toolbar_actions_factory.h"
+#include "chrome/browser/ui/toolbar/toolbar_action_view_controller.h"
+#include "chrome/browser/ui/toolbar/toolbar_actions_bar.h"
+#include "chrome/browser/ui/toolbar/toolbar_actions_model_factory.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/web_contents.h"
-#include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/pref_names.h"
-#include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/feature_switch.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/one_shot_event.h"
 
-namespace extensions {
-
-ExtensionToolbarModel::ExtensionToolbarModel(Profile* profile,
-                                             ExtensionPrefs* extension_prefs)
+ToolbarActionsModel::ToolbarActionsModel(Profile* profile,
+    extensions::ExtensionPrefs* extension_prefs)
     : profile_(profile),
       extension_prefs_(extension_prefs),
       prefs_(profile_->GetPrefs()),
-      extension_action_api_(ExtensionActionAPI::Get(profile_)),
-      extensions_initialized_(false),
-      include_all_extensions_(FeatureSwitch::extension_action_redesign()
-                                  ->IsEnabled()),
+      extension_action_api_(extensions::ExtensionActionAPI::Get(profile_)),
+      extension_registry_(extensions::ExtensionRegistry::Get(profile_)),
+      actions_initialized_(false),
+      use_redesign_(
+          extensions::FeatureSwitch::extension_action_redesign()->IsEnabled()),
       highlight_type_(HIGHLIGHT_NONE),
       extension_action_observer_(this),
       extension_registry_observer_(this),
       weak_ptr_factory_(this) {
-  ExtensionSystem::Get(profile_)->ready().Post(
+  extensions::ExtensionSystem::Get(profile_)->ready().Post(
       FROM_HERE,
-      base::Bind(&ExtensionToolbarModel::OnReady,
+      base::Bind(&ToolbarActionsModel::OnReady,
                  weak_ptr_factory_.GetWeakPtr()));
-  visible_icon_count_ = prefs_->GetInteger(pref_names::kToolbarSize);
+  visible_icon_count_ = prefs_->GetInteger(
+      extensions::pref_names::kToolbarSize);
 
   // We only care about watching the prefs if not in incognito mode.
   if (!profile_->IsOffTheRecord()) {
     pref_change_registrar_.Init(prefs_);
     pref_change_callback_ =
-        base::Bind(&ExtensionToolbarModel::OnExtensionToolbarPrefChange,
+        base::Bind(&ToolbarActionsModel::OnActionToolbarPrefChange,
                    base::Unretained(this));
-    pref_change_registrar_.Add(pref_names::kToolbar, pref_change_callback_);
+    pref_change_registrar_.Add(extensions::pref_names::kToolbar,
+                               pref_change_callback_);
   }
 }
 
-ExtensionToolbarModel::~ExtensionToolbarModel() {
+ToolbarActionsModel::~ToolbarActionsModel() {
 }
 
 // static
-ExtensionToolbarModel* ExtensionToolbarModel::Get(Profile* profile) {
-  return ExtensionToolbarModelFactory::GetForProfile(profile);
+ToolbarActionsModel* ToolbarActionsModel::Get(Profile* profile) {
+  return ToolbarActionsModelFactory::GetForProfile(profile);
 }
 
-void ExtensionToolbarModel::AddObserver(Observer* observer) {
+void ToolbarActionsModel::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
-void ExtensionToolbarModel::RemoveObserver(Observer* observer) {
+void ToolbarActionsModel::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
-void ExtensionToolbarModel::MoveExtensionIcon(const std::string& id,
-                                              size_t index) {
-  ExtensionList::iterator pos = toolbar_items_.begin();
-  while (pos != toolbar_items_.end() && (*pos)->id() != id)
+void ToolbarActionsModel::MoveActionIcon(const std::string& id, size_t index) {
+  std::vector<ToolbarItem>::iterator pos = toolbar_items_.begin();
+  while (pos != toolbar_items_.end() && (*pos).id != id)
     ++pos;
   if (pos == toolbar_items_.end()) {
     NOTREACHED();
     return;
   }
-  scoped_refptr<const Extension> extension = *pos;
+
+  ToolbarItem action = *pos;
   toolbar_items_.erase(pos);
 
-  ExtensionIdList::iterator pos_id = std::find(last_known_positions_.begin(),
-                                               last_known_positions_.end(),
-                                               id);
+  std::vector<std::string>::iterator pos_id =
+      std::find(last_known_positions_.begin(),
+                last_known_positions_.end(),
+                id);
   if (pos_id != last_known_positions_.end())
     last_known_positions_.erase(pos_id);
 
   if (index < toolbar_items_.size()) {
     // If the index is not at the end, find the item currently at |index|, and
-    // insert |extension| before it in both |toolbar_items_| and
+    // insert |action| before it in |toolbar_items_| and |action|'s id in
     // |last_known_positions_|.
-    ExtensionList::iterator iter = toolbar_items_.begin() + index;
+    std::vector<ToolbarItem>::iterator iter = toolbar_items_.begin() + index;
     last_known_positions_.insert(std::find(last_known_positions_.begin(),
                                            last_known_positions_.end(),
-                                           (*iter)->id()),
+                                           (*iter).id),
                                  id);
-    toolbar_items_.insert(iter, extension);
+    toolbar_items_.insert(iter, action);
   } else {
-    // Otherwise, put |extension| at the end.
+    // Otherwise, put |action| and |id| at the end.
     DCHECK_EQ(toolbar_items_.size(), index);
-    index = toolbar_items_.size();
-    toolbar_items_.push_back(extension);
+    toolbar_items_.push_back(action);
     last_known_positions_.push_back(id);
   }
 
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnToolbarExtensionMoved(extension.get(), index));
-  MaybeUpdateVisibilityPref(extension.get(), index);
+  FOR_EACH_OBSERVER(Observer, observers_, OnToolbarActionMoved(id, index));
+  MaybeUpdateVisibilityPref(action, index);
   UpdatePrefs();
 }
 
-void ExtensionToolbarModel::SetVisibleIconCount(size_t count) {
+void ToolbarActionsModel::SetVisibleIconCount(size_t count) {
   visible_icon_count_ = (count >= toolbar_items_.size()) ? -1 : count;
 
   // Only set the prefs if we're not in highlight mode and the profile is not
   // incognito. Highlight mode is designed to be a transitory state, and should
-  //  not persist across browser restarts (though it may be re-entered), and we
+  // not persist across browser restarts (though it may be re-entered), and we
   // don't store anything in incognito.
   if (!is_highlighting() && !profile_->IsOffTheRecord()) {
     // Additionally, if we are using the new toolbar, any icons which are in the
     // overflow menu are considered "hidden". But it so happens that the times
     // we are likely to call SetVisibleIconCount() are also those when we are
     // in flux. So wait for things to cool down before setting the prefs.
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
-        base::Bind(&ExtensionToolbarModel::MaybeUpdateVisibilityPrefs,
+        base::Bind(&ToolbarActionsModel::MaybeUpdateVisibilityPrefs,
                    weak_ptr_factory_.GetWeakPtr()));
-    prefs_->SetInteger(pref_names::kToolbarSize, visible_icon_count_);
+    prefs_->SetInteger(extensions::pref_names::kToolbarSize,
+                       visible_icon_count_);
   }
 
   FOR_EACH_OBSERVER(Observer, observers_, OnToolbarVisibleCountChanged());
 }
 
-void ExtensionToolbarModel::OnExtensionActionUpdated(
+void ToolbarActionsModel::OnExtensionActionUpdated(
     ExtensionAction* extension_action,
     content::WebContents* web_contents,
     content::BrowserContext* browser_context) {
-  const Extension* extension =
-      ExtensionRegistry::Get(profile_)->enabled_extensions().GetByID(
-          extension_action->extension_id());
   // Notify observers if the extension exists and is in the model.
-  if (std::find(toolbar_items_.begin(), toolbar_items_.end(), extension) !=
+  if (std::find(toolbar_items_.begin(), toolbar_items_.end(),
+      ToolbarItem(extension_action->extension_id(), EXTENSION_ACTION)) !=
           toolbar_items_.end()) {
     FOR_EACH_OBSERVER(Observer, observers_,
-                      OnToolbarExtensionUpdated(extension));
+                      OnToolbarActionUpdated(
+                          extension_action->extension_id()));
   }
 }
 
-void ExtensionToolbarModel::OnExtensionActionVisibilityChanged(
+ScopedVector<ToolbarActionViewController> ToolbarActionsModel::CreateActions(
+    Browser* browser, ToolbarActionsBar* bar) {
+  DCHECK(browser);
+  DCHECK(bar);
+  ScopedVector<ToolbarActionViewController> action_list;
+
+  // Get the component action list.
+  ScopedVector<ToolbarActionViewController> component_actions =
+      ComponentToolbarActionsFactory::GetInstance()->
+          GetComponentToolbarActions(browser);
+
+  extensions::ExtensionActionManager* action_manager =
+      extensions::ExtensionActionManager::Get(profile_);
+
+  // toolbar_items() might not equate to toolbar_items_ in the case where a
+  // subset are highlighted.
+  std::vector<ToolbarItem> items = toolbar_items();
+  for (const ToolbarItem& action : items) {
+    if (action.type == EXTENSION_ACTION) {
+      // Get the extension.
+      const extensions::Extension* extension = GetExtensionById(action.id);
+      DCHECK(extension);
+
+      // Create and add an ExtensionActionViewController for the extension.
+      action_list.push_back(new ExtensionActionViewController(
+          extension,
+          browser,
+          action_manager->GetExtensionAction(*extension),
+          bar));
+    } else if (action.type == COMPONENT_ACTION) {
+      DCHECK(use_redesign_);
+      // Find the corresponding action to |action|.
+      for (auto component_action : component_actions) {
+        if (component_action->GetId() == action.id) {
+          action_list.push_back(component_action);
+          break;
+        }
+      }
+    }
+  }
+
+  // We've moved ownership of the subset of the component actions that we
+  // kept track of via toolbar_items() from |component_actions| to
+  // |action_list|, so we don't need to keep track of these.
+  component_actions.weak_clear();
+
+  return action_list.Pass();
+}
+
+void ToolbarActionsModel::OnExtensionActionVisibilityChanged(
     const std::string& extension_id,
     bool is_now_visible) {
-  const Extension* extension =
-      ExtensionRegistry::Get(profile_)->GetExtensionById(
-          extension_id, ExtensionRegistry::EVERYTHING);
-
   // Hiding works differently with the new and old toolbars.
-  if (include_all_extensions_) {
-    // It's possible that we haven't added this extension yet, if its
+  if (use_redesign_) {
+    // It's possible that we haven't added this action yet, if its
     // visibility was adjusted in the course of its initialization.
-    if (std::find(toolbar_items_.begin(), toolbar_items_.end(), extension) ==
+    if (std::find(toolbar_items_.begin(), toolbar_items_.end(),
+        ToolbarItem(extension_id, EXTENSION_ACTION)) ==
             toolbar_items_.end())
       return;
 
     int new_size = 0;
     int new_index = 0;
     if (is_now_visible) {
       // If this action used to be hidden, we can't possibly be showing all.
       DCHECK_LT(visible_icon_count(), toolbar_items_.size());
-      // Grow the bar by one and move the extension to the end of the visibles.
+      // Grow the bar by one and move the action to the end of the visibles.
       new_size = visible_icon_count() + 1;
       new_index = new_size - 1;
     } else {
       // If we're hiding one, we must be showing at least one.
       DCHECK_GE(visible_icon_count(), 0u);
-      // Shrink the bar by one and move the extension to the beginning of the
+      // Shrink the bar by one and move the action to the beginning of the
       // overflow menu.
       new_size = visible_icon_count() - 1;
       new_index = new_size;
     }
     SetVisibleIconCount(new_size);
-    MoveExtensionIcon(extension->id(), new_index);
+    MoveActionIcon(extension_id, new_index);
   } else {  // Don't include all extensions.
+    const extensions::Extension* extension = GetExtensionById(extension_id);
     if (is_now_visible)
       AddExtension(extension);
     else
       RemoveExtension(extension);
   }
 }
 
-void ExtensionToolbarModel::OnExtensionLoaded(
+void ToolbarActionsModel::OnExtensionLoaded(
     content::BrowserContext* browser_context,
-    const Extension* extension) {
+    const extensions::Extension* extension) {
   // We don't want to add the same extension twice. It may have already been
   // added by EXTENSION_BROWSER_ACTION_VISIBILITY_CHANGED below, if the user
   // hides the browser action and then disables and enables the extension.
-  for (size_t i = 0; i < toolbar_items_.size(); i++) {
-    if (toolbar_items_[i].get() == extension)
-      return;
-  }
+  if (std::find(toolbar_items_.begin(), toolbar_items_.end(),
+      ToolbarItem(extension->id(), EXTENSION_ACTION)) !=
+          toolbar_items_.end())
+    return;
 
   AddExtension(extension);
 }
 
-void ExtensionToolbarModel::OnExtensionUnloaded(
+void ToolbarActionsModel::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
-    const Extension* extension,
-    UnloadedExtensionInfo::Reason reason) {
+    const extensions::Extension* extension,
+    extensions::UnloadedExtensionInfo::Reason reason) {
   RemoveExtension(extension);
 }
 
-void ExtensionToolbarModel::OnExtensionUninstalled(
+void ToolbarActionsModel::OnExtensionUninstalled(
     content::BrowserContext* browser_context,
-    const Extension* extension,
+    const extensions::Extension* extension,
     extensions::UninstallReason reason) {
   // Remove the extension id from the ordered list, if it exists (the extension
   // might not be represented in the list because it might not have an icon).
-  ExtensionIdList::iterator pos =
+  std::vector<std::string>::iterator pos =
       std::find(last_known_positions_.begin(),
-                last_known_positions_.end(), extension->id());
+                last_known_positions_.end(),
+                extension->id());
 
   if (pos != last_known_positions_.end()) {
     last_known_positions_.erase(pos);
     UpdatePrefs();
   }
 }
 
-void ExtensionToolbarModel::OnReady() {
-  ExtensionRegistry* registry = ExtensionRegistry::Get(profile_);
-  InitializeExtensionList();
+void ToolbarActionsModel::OnReady() {
+  InitializeActionList();
   // Wait until the extension system is ready before observing any further
   // changes so that the toolbar buttons can be shown in their stable ordering
   // taken from prefs.
-  extension_registry_observer_.Add(registry);
+  extension_registry_observer_.Add(extension_registry_);
   extension_action_observer_.Add(extension_action_api_);
 
   if (ExtensionToolbarIconSurfacingBubbleDelegate::ShouldShowForProfile(
-          profile_)) {
-    ExtensionIdList ids;
-    for (const auto& extension : toolbar_items_)
-      ids.push_back(extension->id());
-    HighlightExtensions(ids, HIGHLIGHT_INFO);
+      profile_)) {
+    std::vector<std::string> ids;
+    for (const ToolbarItem& action : toolbar_items_)
+      ids.push_back(action.id);
+    HighlightActions(ids, HIGHLIGHT_INFO);
   }
 
-  extensions_initialized_ = true;
+  actions_initialized_ = true;
   FOR_EACH_OBSERVER(Observer, observers_, OnToolbarModelInitialized());
 }
 
-size_t ExtensionToolbarModel::FindNewPositionFromLastKnownGood(
-    const Extension* extension) {
-  // See if we have last known good position for this extension.
+size_t ToolbarActionsModel::FindNewPositionFromLastKnownGood(
+    const ToolbarItem& action) {
+  // See if we have last known good position for this action.
   size_t new_index = 0;
-  // Loop through the ID list of known positions, to count the number of visible
-  // extension icons preceding |extension|.
-  for (ExtensionIdList::const_iterator iter_id = last_known_positions_.begin();
-       iter_id < last_known_positions_.end(); ++iter_id) {
-    if ((*iter_id) == extension->id())
+  // Loop through the ID list of known positions, to count the number of
+  // visible action icons preceding |action|'s id.
+  for (const std::string& last_pos_id : last_known_positions_) {
+    if (last_pos_id == action.id)
       return new_index;  // We've found the right position.
-    // Found an id, need to see if it is visible.
-    for (ExtensionList::const_iterator iter_ext = toolbar_items_.begin();
-         iter_ext < toolbar_items_.end(); ++iter_ext) {
-      if ((*iter_ext)->id() == (*iter_id)) {
+    // Found an action, need to see if it is visible.
+    for (const ToolbarItem& item : toolbar_items_) {
+      if (item.id == last_pos_id) {
         // This extension is visible, update the index value.
         ++new_index;
         break;
       }
     }
   }
 
   // Position not found.
   return toolbar_items_.size();
 }
 
-bool ExtensionToolbarModel::ShouldAddExtension(const Extension* extension) {
+bool ToolbarActionsModel::ShouldAddExtension(
+    const extensions::Extension* extension) {
   // In incognito mode, don't add any extensions that aren't incognito-enabled.
   if (profile_->IsOffTheRecord() &&
-      !util::IsIncognitoEnabled(extension->id(), profile_))
+      !extensions::util::IsIncognitoEnabled(extension->id(), profile_))
     return false;
 
-  ExtensionActionManager* action_manager =
-      ExtensionActionManager::Get(profile_);
-  if (include_all_extensions_) {
+  extensions::ExtensionActionManager* action_manager =
+      extensions::ExtensionActionManager::Get(profile_);
+  if (use_redesign_) {
     // In this case, we don't care about the browser action visibility, because
     // we want to show each extension regardless.
-    // TODO(devlin): Extension actions which are not visible should be moved to
-    // the overflow menu by default.
     return action_manager->GetExtensionAction(*extension) != NULL;
   }
 
   return action_manager->GetBrowserAction(*extension) &&
          extension_action_api_->GetBrowserActionVisibility(extension->id());
 }
 
-void ExtensionToolbarModel::AddExtension(const Extension* extension) {
+void ToolbarActionsModel::AddExtension(const extensions::Extension* extension) {
   // We only use AddExtension() once the system is initialized.
-  DCHECK(extensions_initialized_);
+  DCHECK(actions_initialized_);
   if (!ShouldAddExtension(extension))
     return;
 
   // See if we have a last known good position for this extension.
   bool is_new_extension =
       std::find(last_known_positions_.begin(),
                 last_known_positions_.end(),
                 extension->id()) == last_known_positions_.end();
 
   // New extensions go at the right (end) of the visible extensions. Other
   // extensions go at their previous position.
   size_t new_index = 0;
   if (is_new_extension) {
-    new_index = Manifest::IsComponentLocation(extension->location()) ?
-        0 : visible_icon_count();
+    new_index = extensions::Manifest::IsComponentLocation(
+        extension->location()) ? 0 : visible_icon_count();
     // For the last-known position, we use the index of the extension that is
     // just before this extension, plus one. (Note that this isn't the same
     // as new_index + 1, because last_known_positions_ can include disabled
     // extensions.)
     int new_last_known_index =
         new_index == 0 ? 0 :
         std::find(last_known_positions_.begin(),
                   last_known_positions_.end(),
-                  toolbar_items_[new_index - 1]->id()) -
+                  toolbar_items_[new_index - 1].id) -
             last_known_positions_.begin() + 1;
     // In theory, the extension before this one should always
     // be in last known positions, but if something funny happened with prefs,
     // make sure we handle it.
     // TODO(devlin): Track down these cases so we can CHECK this.
     new_last_known_index =
         std::min<int>(new_last_known_index, last_known_positions_.size());
     last_known_positions_.insert(
         last_known_positions_.begin() + new_last_known_index, extension->id());
     UpdatePrefs();
   } else {
-    new_index = FindNewPositionFromLastKnownGood(extension);
+    new_index = FindNewPositionFromLastKnownGood(
+        ToolbarItem(extension->id(), EXTENSION_ACTION));
   }
 
-  toolbar_items_.insert(toolbar_items_.begin() + new_index, extension);
+  toolbar_items_.insert(toolbar_items_.begin() + new_index,
+      ToolbarItem(extension->id(), EXTENSION_ACTION));
 
   // If we're currently highlighting, then even though we add a browser action
   // to the full list (|toolbar_items_|, there won't be another *visible*
   // browser action, which was what the observers care about.
   if (!is_highlighting()) {
     FOR_EACH_OBSERVER(Observer, observers_,
-                      OnToolbarExtensionAdded(extension, new_index));
+                      OnToolbarActionAdded(extension->id(), new_index));
 
     int visible_count_delta = 0;
     if (is_new_extension && !all_icons_visible()) {
       // If this is a new extension (and not all extensions are visible), we
       // expand the toolbar out so that the new one can be seen.
       visible_count_delta = 1;
     } else if (profile_->IsOffTheRecord()) {
       // If this is an incognito profile, we also have to check to make sure the
       // overflow matches the main bar's status.
-      ExtensionToolbarModel* main_model =
-          ExtensionToolbarModel::Get(profile_->GetOriginalProfile());
+      ToolbarActionsModel* main_model =
+          ToolbarActionsModel::Get(profile_->GetOriginalProfile());
       // Find what the index will be in the main bar. Because Observer calls are
       // nondeterministic, we can't just assume the main bar will have the
       // extension and look it up.
-      size_t main_index =
-          main_model->FindNewPositionFromLastKnownGood(extension);
+      size_t main_index = main_model->FindNewPositionFromLastKnownGood(
+          ToolbarItem(extension->id(), EXTENSION_ACTION));
       bool visible = main_index < main_model->visible_icon_count();
       // We may need to adjust the visible count if the incognito bar isn't
       // showing all icons and this one is visible, or if it is showing all
       // icons and this is hidden.
       if (visible && !all_icons_visible())
         visible_count_delta = 1;
       else if (!visible && all_icons_visible())
         visible_count_delta = -1;
     }
 
     if (visible_count_delta)
       SetVisibleIconCount(visible_icon_count() + visible_count_delta);
   }
 
-  MaybeUpdateVisibilityPref(extension, new_index);
+  MaybeUpdateVisibilityPref(ToolbarItem(extension->id(), EXTENSION_ACTION),
+                            new_index);
 }
 
-void ExtensionToolbarModel::RemoveExtension(const Extension* extension) {
-  ExtensionList::iterator pos =
-      std::find(toolbar_items_.begin(), toolbar_items_.end(), extension);
+void ToolbarActionsModel::RemoveExtension(
+    const extensions::Extension* extension) {
+  std::vector<ToolbarItem>::iterator pos =
+      std::find(toolbar_items_.begin(), toolbar_items_.end(),
+          ToolbarItem(extension->id(), EXTENSION_ACTION));
+
   if (pos == toolbar_items_.end())
     return;
 
   size_t index = pos - toolbar_items_.begin();
   // If the removed extension was on the toolbar, a new one will take its place
   // if there are any in overflow.
   bool new_extension_shown =
       !all_icons_visible() && index < visible_icon_count();
 
   // If our visible count is set to the current size, we need to decrement it.
   if (visible_icon_count_ == static_cast<int>(toolbar_items_.size()))
     SetVisibleIconCount(toolbar_items_.size() - 1);
 
   toolbar_items_.erase(pos);
 
   // If we're in highlight mode, we also have to remove the extension from
   // the highlighted list.
   if (is_highlighting()) {
     pos = std::find(highlighted_items_.begin(),
                     highlighted_items_.end(),
-                    extension);
+                    ToolbarItem(extension->id(), EXTENSION_ACTION));
     if (pos != highlighted_items_.end()) {
       highlighted_items_.erase(pos);
       FOR_EACH_OBSERVER(Observer, observers_,
-                        OnToolbarExtensionRemoved(extension));
+                        OnToolbarActionRemoved(extension->id()));
       // If the highlighted list is now empty, we stop highlighting.
       if (highlighted_items_.empty())
         StopHighlighting();
     }
   } else {
     FOR_EACH_OBSERVER(Observer, observers_,
-                      OnToolbarExtensionRemoved(extension));
+                      OnToolbarActionRemoved(extension->id()));
   }
 
   UpdatePrefs();
   if (new_extension_shown) {
     size_t newly_visible_index = visible_icon_count() - 1;
-    MaybeUpdateVisibilityPref(toolbar_items_[newly_visible_index].get(),
+    MaybeUpdateVisibilityPref(toolbar_items_[newly_visible_index],
                               newly_visible_index);
   }
 }
 
 // Combine the currently enabled extensions that have browser actions (which
-// we get from the ExtensionRegistry) with the ordering we get from the
-// pref service. For robustness we use a somewhat inefficient process:
-// 1. Create a vector of extensions sorted by their pref values. This vector may
+// we get from the ExtensionRegistry) and component actions (which we get from
+// ComponentToolbarActionsFactory) with the ordering we get from the pref
+// service. For robustness we use a somewhat inefficient process:
+// 1. Create a vector of actions sorted by their pref values. This vector may
 // have holes.
-// 2. Create a vector of extensions that did not have a pref value.
+// 2. Create a vector of actions that did not have a pref value.
 // 3. Remove holes from the sorted vector and append the unsorted vector.
-void ExtensionToolbarModel::InitializeExtensionList() {
+void ToolbarActionsModel::InitializeActionList() {
   DCHECK(toolbar_items_.empty());  // We shouldn't have any items yet.
 
   last_known_positions_ = extension_prefs_->GetToolbarOrder();
   if (profile_->IsOffTheRecord())
     IncognitoPopulate();
   else
     Populate(&last_known_positions_);
 
   MaybeUpdateVisibilityPrefs();
 }
 
-void ExtensionToolbarModel::Populate(ExtensionIdList* positions) {
+void ToolbarActionsModel::Populate(std::vector<std::string>* positions) {
   DCHECK(!profile_->IsOffTheRecord());
-  const ExtensionSet& extensions =
-      ExtensionRegistry::Get(profile_)->enabled_extensions();
-  // Items that have explicit positions.
-  ExtensionList sorted(positions->size(), NULL);
-  // The items that don't have explicit positions.
-  ExtensionList unsorted;
 
-  // Create the lists.
+  std::vector<ToolbarItem> all_actions;
+  // Ids of actions that have explicit positions.
+  std::vector<ToolbarItem> sorted(positions->size(), ToolbarItem());
+  // Ids of actions that don't have explicit positions.
+  std::vector<ToolbarItem> unsorted;
+
+  // Populate the lists.
   int hidden = 0;
-  for (const scoped_refptr<const Extension>& extension : extensions) {
+  int browser_actions_count = 0;
+  int component_actions_count = 0;
+
+  // First, add the extension action ids to all_actions.
+  const extensions::ExtensionSet& extensions =
+      extension_registry_->enabled_extensions();
+  for (const scoped_refptr<const extensions::Extension>& extension :
+       extensions) {
     if (!ShouldAddExtension(extension.get())) {
       if (!extension_action_api_->GetBrowserActionVisibility(extension->id()))
         ++hidden;
       continue;
     }
 
-    ExtensionIdList::const_iterator pos =
-        std::find(positions->begin(), positions->end(), extension->id());
+    all_actions.push_back(ToolbarItem(extension->id(), EXTENSION_ACTION));
+  }
+
+  // Next, add the component action ids.
+  scoped_ptr<std::vector<std::string>> component_ids =
+      ComponentToolbarActionsFactory::GetComponentIds();
+  for (const std::string& id : *component_ids)
+    all_actions.push_back(ToolbarItem(id, COMPONENT_ACTION));
+
+  // Add each action id to the appropriate list.
+  for (const ToolbarItem& action : all_actions) {
+    std::vector<std::string>::const_iterator pos =
+        std::find(positions->begin(),
+                  positions->end(),
+                  action.id);
     if (pos != positions->end()) {
-      sorted[pos - positions->begin()] = extension;
+      sorted[pos - positions->begin()] = action;
     } else {
-      // Unknown extension - push it to the back of unsorted, and add it to the
+      // Unknown action - push it to the back of unsorted, and add it to the
       // list of ids at the end.
-      unsorted.push_back(extension);
-      positions->push_back(extension->id());
+      unsorted.push_back(action);
+      positions->push_back(action.id);
     }
   }
 
   // Merge the lists.
   sorted.insert(sorted.end(), unsorted.begin(), unsorted.end());
   toolbar_items_.reserve(sorted.size());
 
-  for (const scoped_refptr<const Extension>& extension : sorted) {
-    // It's possible for the extension order to contain items that aren't
-    // actually loaded on this machine.  For example, when extension sync is on,
-    // we sync the extension order as-is but double-check with the user before
-    // syncing NPAPI-containing extensions, so if one of those is not actually
-    // synced, we'll get a NULL in the list.  This sort of case can also happen
-    // if some error prevents an extension from loading.
-    if (extension.get()) {
-      // We don't notify observers of the added extension yet. Rather, observers
-      // should wait for the "OnToolbarModelInitialized" notification, and then
-      // bulk-update. (This saves a lot of bouncing-back-and-forth here, and
-      // allows observers to ensure that the extension system is always
-      // initialized before using the extensions).
-      toolbar_items_.push_back(extension);
+  // We don't notify observers of the added extension yet. Rather, observers
+  // should wait for the "OnToolbarModelInitialized" notification, and then
+  // bulk-update. (This saves a lot of bouncing-back-and-forth here, and allows
+  // observers to ensure that the extension system is always initialized before
+  // using the extensions).
+  for (const ToolbarItem& action : sorted) {
+    if (action.type == EXTENSION_ACTION) {
+      // It's possible for the extension order to contain items that aren't
+      // actually loaded on this machine.  For example, when extension sync is
+      // on, we sync the extension order as-is but double-check with the user
+      // before syncing NPAPI-containing extensions, so if one of those is not
+      // actually synced, we'll get a NULL in the list.  This sort of case can
+      // also happen if some error prevents an extension from loading.
+      if (GetExtensionById(action.id)) {
+        toolbar_items_.push_back(ToolbarItem(action.id, EXTENSION_ACTION));
+        ++browser_actions_count;
+      }
+    } else if (action.type == COMPONENT_ACTION) {
+      toolbar_items_.push_back(ToolbarItem(action.id, COMPONENT_ACTION));
+      ++component_actions_count;
     }
   }
 
+  // Histogram names are prefixed with "ExtensionToolbarModel" rather than
+  // "ToolbarActionsModel" for historical reasons.
   UMA_HISTOGRAM_COUNTS_100(
       "ExtensionToolbarModel.BrowserActionsPermanentlyHidden", hidden);
   UMA_HISTOGRAM_COUNTS_100("ExtensionToolbarModel.BrowserActionsCount",
+                           browser_actions_count);
+  UMA_HISTOGRAM_COUNTS_100("Toolbar.ActionsModel.ComponentActionsCount",
+                           component_actions_count);
+  UMA_HISTOGRAM_COUNTS_100("Toolbar.ActionsModel.OverallActionsCount",
                            toolbar_items_.size());
 
   if (!toolbar_items_.empty()) {
     // Visible count can be -1, meaning: 'show all'. Since UMA converts negative
     // values to 0, this would be counted as 'show none' unless we convert it to
     // max.
+    int visible_browser_icon_size = visible_icon_count_ -
+        component_actions_count;

[Devlin, 2015/08/17 16:32:21]

visible_browser_icon_size sounds wrong for what this is.  Also, this will be a
pretty wonky value if visible_icon_count_ is -1.  What about instead:
visible_extension_actions = visible_icon_count_ == -1 ?
    visible_icon_count_ : visible_icon_count_ - component_actions_count;

[apacible, 2015/08/17 18:23:32]

Done.

     UMA_HISTOGRAM_COUNTS_100("ExtensionToolbarModel.BrowserActionsVisible",
                              visible_icon_count_ == -1 ?
                                  base::HistogramBase::kSampleType_MAX :
+                                 visible_browser_icon_size);
+    UMA_HISTOGRAM_COUNTS_100("Toolbar.ActionsModel.ToolbarActionsVisible",

[Devlin, 2015/08/17 16:32:21]

This is only going to be interested (i.e., vary from BrowserActionsVisible) if
the redesign is enabled.  I think we should probably gate the recording on that,
add a comment saying such.

[apacible, 2015/08/17 18:23:32]

Done.

+                             visible_icon_count_ == -1 ?
+                                 base::HistogramBase::kSampleType_MAX :
                                  visible_icon_count_);
   }
 }
 
-void ExtensionToolbarModel::IncognitoPopulate() {
+void ToolbarActionsModel::IncognitoPopulate() {
   DCHECK(profile_->IsOffTheRecord());
-  const ExtensionToolbarModel* original_model =
-      ExtensionToolbarModel::Get(profile_->GetOriginalProfile());
+  const ToolbarActionsModel* original_model =
+      ToolbarActionsModel::Get(profile_->GetOriginalProfile());
 
   // Find the absolute value of the original model's count.
   int original_visible = original_model->visible_icon_count();
 
-  // In incognito mode, we show only those extensions that are
-  // incognito-enabled. Further, any actions that were overflowed in regular
-  // mode are still overflowed. Order is the same as in regular mode.
+  // In incognito mode, we show only those actions that are incognito-enabled
+  // Further, any actions that were overflowed in regular mode are still
+  // overflowed. Order is the same as in regular mode.
   visible_icon_count_ = 0;
-  for (ExtensionList::const_iterator iter =
-           original_model->toolbar_items_.begin();
+
+  for (std::vector<ToolbarItem>::const_iterator iter =
+       original_model->toolbar_items_.begin();
        iter != original_model->toolbar_items_.end(); ++iter) {
-    if (ShouldAddExtension(iter->get())) {
+    if ((*iter).type == EXTENSION_ACTION) {

[Devlin, 2015/08/17 16:32:21]

The body of this for-loop seems like it would be simpler as:
// The extension might not be shown in incognito mode. For now, all component
// actions are present.
if (iter->type == EXTENSION_ACTION && !
    ShouldAddExtension(GetExetnsionById(iter->id())
  continue;
toolbar_items_.push_back(*iter);
if (iter - original_model->toolbar_items_.begin() < original_visible)
  ++visible_icon_count_;

[apacible, 2015/08/17 18:23:32]

Done.

+      if (ShouldAddExtension(GetExtensionById((*iter).id))) {

[Devlin, 2015/08/17 16:32:21]

nit: prefer iter->id, rather than (*iter).id (this goes for anywhere).  The only
time we use (*iter) is when it's an iterator to a pointer, so that it comes out
like (*iter)->id.

[apacible, 2015/08/17 18:23:32]

Done and changed elsewhere.

+        toolbar_items_.push_back(*iter);
+        if (iter - original_model->toolbar_items_.begin() < original_visible)
+          ++visible_icon_count_;
+      }
+    } else if ((*iter).type == COMPONENT_ACTION) {
+      // At the moment, we assume component actions will always be present
+      // in incognito. This may change in the future if there are component
+      // actions that should not be enabled in incognito.
       toolbar_items_.push_back(*iter);
       if (iter - original_model->toolbar_items_.begin() < original_visible)
         ++visible_icon_count_;
     }
   }
 }
 
-void ExtensionToolbarModel::UpdatePrefs() {
+void ToolbarActionsModel::UpdatePrefs() {
   if (!extension_prefs_ || profile_->IsOffTheRecord())
     return;
 
   // Don't observe change caused by self.
-  pref_change_registrar_.Remove(pref_names::kToolbar);
+  pref_change_registrar_.Remove(extensions::pref_names::kToolbar);
   extension_prefs_->SetToolbarOrder(last_known_positions_);
-  pref_change_registrar_.Add(pref_names::kToolbar, pref_change_callback_);
+  pref_change_registrar_.Add(extensions::pref_names::kToolbar,
+                             pref_change_callback_);
 }
 
-void ExtensionToolbarModel::MaybeUpdateVisibilityPref(
-    const Extension* extension, size_t index) {
+void ToolbarActionsModel::MaybeUpdateVisibilityPref(const ToolbarItem& action,
+                                                    size_t index) {
+  // Component actions don't have prefs to update.
+  if (action.type == COMPONENT_ACTION)
+    return;
+
   // We only update the visibility pref for hidden/not hidden based on the
   // overflow menu with the new toolbar design.
-  if (include_all_extensions_ && !profile_->IsOffTheRecord()) {
+  if (use_redesign_ && !profile_->IsOffTheRecord()) {
     bool visible = index < visible_icon_count();
-    if (visible != extension_action_api_->GetBrowserActionVisibility(
-                       extension->id())) {
+    if (visible !=
+        extension_action_api_->GetBrowserActionVisibility(action.id)) {
       // Don't observe changes caused by ourselves.
       bool was_registered = false;
       if (extension_action_observer_.IsObserving(extension_action_api_)) {
         was_registered = true;
         extension_action_observer_.RemoveAll();
       }
-      extension_action_api_->SetBrowserActionVisibility(extension->id(),
-                                                       visible);
+      extension_action_api_->SetBrowserActionVisibility(action.id, visible);
       if (was_registered)
         extension_action_observer_.Add(extension_action_api_);
     }
   }
 }
 
-void ExtensionToolbarModel::MaybeUpdateVisibilityPrefs() {
+void ToolbarActionsModel::MaybeUpdateVisibilityPrefs() {
   for (size_t i = 0u; i < toolbar_items_.size(); ++i)
-    MaybeUpdateVisibilityPref(toolbar_items_[i].get(), i);
+    MaybeUpdateVisibilityPref(toolbar_items_[i], i);
 }
 
-void ExtensionToolbarModel::OnExtensionToolbarPrefChange() {
+void ToolbarActionsModel::OnActionToolbarPrefChange() {
   // If extensions are not ready, defer to later Populate() call.
-  if (!extensions_initialized_)
+  if (!actions_initialized_)
     return;
 
   // Recalculate |last_known_positions_| to be |pref_positions| followed by
   // ones that are only in |last_known_positions_|.
-  ExtensionIdList pref_positions = extension_prefs_->GetToolbarOrder();
+  std::vector<std::string> pref_positions = extension_prefs_->GetToolbarOrder();
   size_t pref_position_size = pref_positions.size();
   for (size_t i = 0; i < last_known_positions_.size(); ++i) {
     if (std::find(pref_positions.begin(), pref_positions.end(),
                   last_known_positions_[i]) == pref_positions.end()) {
       pref_positions.push_back(last_known_positions_[i]);
     }
   }
   last_known_positions_.swap(pref_positions);
 
   int desired_index = 0;
   // Loop over the updated list of last known positions, moving any extensions
   // that are in the wrong place.
   for (const std::string& id : last_known_positions_) {
     int current_index = GetIndexForId(id);
     if (current_index == -1)
       continue;
     if (current_index != desired_index) {
-      scoped_refptr<const Extension> extension = toolbar_items_[current_index];
+      ToolbarItem action = toolbar_items_[current_index];
       toolbar_items_.erase(toolbar_items_.begin() + current_index);
-      toolbar_items_.insert(toolbar_items_.begin() + desired_index, extension);
+      toolbar_items_.insert(toolbar_items_.begin() + desired_index, action);
       // Notify the observers to keep them up-to-date.
-      FOR_EACH_OBSERVER(
-          Observer, observers_,
-          OnToolbarExtensionMoved(extension.get(), desired_index));
+      FOR_EACH_OBSERVER(Observer, observers_,
+                        OnToolbarActionMoved(action.id, desired_index));
     }
     ++desired_index;
   }
 
   if (last_known_positions_.size() > pref_position_size) {
     // Need to update pref because we have extra icons. But can't call
     // UpdatePrefs() directly within observation closure.
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(&ExtensionToolbarModel::UpdatePrefs,
+        FROM_HERE, base::Bind(&ToolbarActionsModel::UpdatePrefs,
                               weak_ptr_factory_.GetWeakPtr()));
   }
 }
 
-int ExtensionToolbarModel::GetIndexForId(const std::string& id) const {
+int ToolbarActionsModel::GetIndexForId(const std::string& id) const {
   for (size_t i = 0; i < toolbar_items().size(); ++i) {
-    if (toolbar_items()[i]->id() == id)
+    if (toolbar_items()[i].id == id)
       return i;
   }
   return -1;
 }
 
-bool ExtensionToolbarModel::ShowExtensionActionPopup(
-    const Extension* extension,
-    Browser* browser,
-    bool grant_active_tab) {
+bool ToolbarActionsModel::ShowToolbarActionPopup(const std::string& id,
+                                                 Browser* browser,
+                                                 bool grant_active_tab) {
   base::ObserverListBase<Observer>::Iterator it(&observers_);
   Observer* obs = NULL;
   // Look for the Observer associated with the browser.
   // This would be cleaner if we had an abstract class for the Toolbar UI
   // (like we do for LocationBar), but sadly, we don't.
   while ((obs = it.GetNext()) != NULL) {
     if (obs->GetBrowser() == browser)
-      return obs->ShowExtensionActionPopup(extension, grant_active_tab);
+      return obs->ShowToolbarActionPopup(id, grant_active_tab);
   }
   return false;
 }
 
-void ExtensionToolbarModel::EnsureVisibility(
-    const ExtensionIdList& extension_ids) {
+void ToolbarActionsModel::EnsureVisibility(
+    const std::vector<std::string>& ids) {
   if (all_icons_visible())
     return;  // Already showing all.
 
   // Otherwise, make sure we have enough room to show all the extensions
   // requested.
-  if (visible_icon_count() < extension_ids.size())
-    SetVisibleIconCount(extension_ids.size());
+  if (visible_icon_count() < ids.size())
+    SetVisibleIconCount(ids.size());
 
   if (all_icons_visible())
     return;  // May have been set to max by SetVisibleIconCount.
 
   // Guillotine's Delight: Move an orange noble to the front of the line.
-  for (ExtensionIdList::const_iterator it = extension_ids.begin();
-       it != extension_ids.end(); ++it) {
-    for (ExtensionList::const_iterator extension = toolbar_items_.begin();
-         extension != toolbar_items_.end(); ++extension) {
-      if ((*extension)->id() == (*it)) {
-        if (extension - toolbar_items_.begin() >=
-                static_cast<int>(visible_icon_count()))
-          MoveExtensionIcon((*extension)->id(), 0);
+  for (std::vector<std::string>::const_iterator it = ids.begin();
+       it != ids.end(); ++it) {
+    for (std::vector<ToolbarItem>::const_iterator item = toolbar_items_.begin();
+         item != toolbar_items_.end(); ++item) {
+      if ((*item).id == *it) {
+        if (item - toolbar_items_.begin() >=
+            static_cast<int>(visible_icon_count()))
+          MoveActionIcon(*it, 0);
         break;
       }
     }
   }
 }
 
-bool ExtensionToolbarModel::HighlightExtensions(
-    const ExtensionIdList& extension_ids,
-    HighlightType highlight_type) {
+bool ToolbarActionsModel::HighlightActions(const std::vector<std::string>& ids,
+                                           HighlightType highlight_type) {
   highlighted_items_.clear();
 
-  for (ExtensionIdList::const_iterator id = extension_ids.begin();
-       id != extension_ids.end();
-       ++id) {
-    for (ExtensionList::const_iterator extension = toolbar_items_.begin();
-         extension != toolbar_items_.end();
-         ++extension) {
-      if (*id == (*extension)->id())
-        highlighted_items_.push_back(*extension);
+  for (const std::string& action_id : ids) {
+    for (const ToolbarItem& item : toolbar_items_) {
+      if (action_id == item.id)
+        highlighted_items_.push_back(item);
     }
   }
 
   // If we have any items in |highlighted_items_|, then we entered highlighting
   // mode.
   if (highlighted_items_.size()) {
     // It's important that is_highlighting_ is changed immediately before the
     // observers are notified since it changes the result of toolbar_items().
     highlight_type_ = highlight_type;
     FOR_EACH_OBSERVER(Observer, observers_,
                       OnToolbarHighlightModeChanged(true));
 
     // We set the visible icon count after the highlight mode change because
     // the UI actions are created/destroyed during highlight, and doing that
     // prior to changing the size allows us to still have smooth animations.
-    if (visible_icon_count() < extension_ids.size())
-      SetVisibleIconCount(extension_ids.size());
+    if (visible_icon_count() < ids.size())
+      SetVisibleIconCount(ids.size());
 
     return true;
   }
 
   // Otherwise, we didn't enter highlighting mode (and, in fact, exited it if
   // we were otherwise in it).
   if (is_highlighting())
     StopHighlighting();
   return false;
 }
 
-void ExtensionToolbarModel::StopHighlighting() {
+void ToolbarActionsModel::StopHighlighting() {
   if (is_highlighting()) {
     // It's important that is_highlighting_ is changed immediately before the
     // observers are notified since it changes the result of toolbar_items().
     highlight_type_ = HIGHLIGHT_NONE;
     FOR_EACH_OBSERVER(Observer, observers_,
                       OnToolbarHighlightModeChanged(false));
 
     // For the same reason, we don't clear highlighted_items_ until after the
     // mode changed.
     highlighted_items_.clear();
 
     // We set the visible icon count after the highlight mode change because
     // the UI actions are created/destroyed during highlight, and doing that
     // prior to changing the size allows us to still have smooth animations.
-    int saved_icon_count = prefs_->GetInteger(pref_names::kToolbarSize);
+    int saved_icon_count = prefs_->GetInteger(
+        extensions::pref_names::kToolbarSize);
     if (saved_icon_count != visible_icon_count_)
       SetVisibleIconCount(saved_icon_count);
   }
 }
 
-bool ExtensionToolbarModel::RedesignIsShowingNewIcons() const {
-  for (const scoped_refptr<const Extension>& extension : toolbar_items_) {
-    // Without the redesign, we only show extensions with browser actions.
-    // Any extension without a browser action is an indication that we're
-    // showing something new.
-    if (!extension->manifest()->HasKey(manifest_keys::kBrowserAction))
-      return true;
+bool ToolbarActionsModel::RedesignIsShowingNewIcons() const {
+  for (const ToolbarItem& action : toolbar_items_) {
+    if (action.type == EXTENSION_ACTION) {
+      // Without the redesign, we only show extensions with browser actions.
+      // Any extension without a browser action is an indication that we're
+      // showing something new.
+      if (!GetExtensionById(action.id)->manifest()->HasKey(
+          extensions::manifest_keys::kBrowserAction))
+        return true;
+    }
   }
   return false;
 }
 
-}  // namespace extensions
+const extensions::Extension* ToolbarActionsModel::GetExtensionById(
+    const std::string& id) const {
+  return extension_registry_->enabled_extensions().GetByID(id);
+}