Handle app custom icon via aura::Window property.

chrome/browser/ui/ash/launcher/chrome_launcher_controller.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/ui/ash/launcher/chrome_launcher_controller.h"
 
 #include "ash/multi_profile_uma.h"
 #include "ash/public/cpp/shelf_item.h"
 #include "ash/public/interfaces/constants.mojom.h"
 #include "ash/resources/grit/ash_resources.h"
@@ skipping 403 matching lines @@
       AppShortcutLauncherItemController::Create(shelf_id);
   if (!item_delegate->GetRunningApplications().empty())
     SelectItemWithSource(item_delegate.get(), source);
   else
     LaunchApp(shelf_id, source, event_flags);
 }
 
 void ChromeLauncherController::SetLauncherItemImage(
     const ash::ShelfID& shelf_id,
     const gfx::ImageSkia& image) {
+  DCHECK(!image.isNull());
   const ash::ShelfItem* item = GetItem(shelf_id);
   if (item) {
     ash::ShelfItem new_item = *item;
     new_item.image = image;
     model_->Set(model_->ItemIndexByID(shelf_id), new_item);
   }
 }
 
+void ChromeLauncherController::UpdateAppItemImage(const std::string& app_id) {
+  AppIconLoader* icon_loader = GetAppIconLoaderForApp(app_id);
+  if (icon_loader)
+    icon_loader->UpdateImage(app_id);
+}
+
 void ChromeLauncherController::UpdateAppState(content::WebContents* contents,
                                               AppState app_state) {
   ash::ShelfID shelf_id(launcher_controller_helper_->GetAppID(contents));
 
   // Check if the gMail app is loaded and it matches the given content.
   // This special treatment is needed to address crbug.com/234268.
   if (shelf_id.IsNull() && ContentCanBeHandledByGmailApp(contents))
     shelf_id = ash::ShelfID(kGmailAppId);
 
   // If the tab changed apps, remove its association with the previous app item.
@@ skipping 236 matching lines @@
 void ChromeLauncherController::OnUserProfileReadyToSwitch(Profile* profile) {
   if (user_switch_observer_.get())
     user_switch_observer_->OnUserProfileReadyToSwitch(profile);
 }
 
 ArcAppDeferredLauncherController*
 ChromeLauncherController::GetArcDeferredLauncher() {
   return arc_deferred_launcher_.get();
 }
 
 AppIconLoader* ChromeLauncherController::GetAppIconLoaderForApp(

[msw, 2017/05/23 00:02:29]

nit: reorder to match decl

[khmel, 2017/05/23 16:11:43]

Done.

     const std::string& app_id) {
   for (const auto& app_icon_loader : app_icon_loaders_) {
     if (app_icon_loader->CanLoadImageForApp(app_id))
       return app_icon_loader.get();
   }
 
   return nullptr;
 }
 
 void ChromeLauncherController::SetShelfAutoHideBehaviorFromPrefs() {
@@ skipping 676 matching lines @@
           : IDS_ASH_SHELF_APP_LIST_LAUNCHER_TITLE);
 
   const int app_list_index = model_->GetItemIndexForType(ash::TYPE_APP_LIST);
   DCHECK_GE(app_list_index, 0);
   ash::ShelfItem item = model_->items()[app_list_index];
   if (item.title != title) {
     item.title = title;
     model_->Set(app_list_index, item);
   }
 }