arc: Set custom icon in shelf for ARC apps.

chrome/browser/ui/app_list/arc/arc_app_list_prefs.h

Index: chrome/browser/ui/app_list/arc/arc_app_list_prefs.h
diff --git a/chrome/browser/ui/app_list/arc/arc_app_list_prefs.h b/chrome/browser/ui/app_list/arc/arc_app_list_prefs.h
index a7eed495ef1b4d93420270fdb7ce996a0c37d057..a80722061fb37042fd229863910a38329ad9caac 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_list_prefs.h
+++ b/chrome/browser/ui/app_list/arc/arc_app_list_prefs.h
@@ -129,6 +129,11 @@ class ArcAppListPrefs
     virtual void OnTaskDestroyed(int32_t task_id) {}
     // Notifies that task has been activated and moved to the front.
     virtual void OnTaskSetActive(int32_t task_id) {}
+    // Notifies that task description has been updated.
+    virtual void OnTaskSetDescription(
+        int32_t task_id,
+        const std::string& label,
+        const std::vector<uint8_t>& icon_png_data) {}
 
     virtual void OnNotificationsEnabledChanged(
         const std::string& package_name, bool enabled) {}
@@ -288,15 +293,18 @@ class ArcAppListPrefs
                      const base::Optional<std::string>& intent) override;
   void OnTaskDestroyed(int32_t task_id) override;
   void OnTaskSetActive(int32_t task_id) override;
+  void OnTaskOrientationLockRequested(
+      int32_t task_id,
+      const arc::mojom::OrientationLock orientation_lock) override;
+  void OnTaskSetDescription(int32_t task_id,
+                            const std::string& label,
+                            const std::vector<uint8_t>& icon_png_data) override;
   void OnNotificationsEnabledChanged(const std::string& package_name,
                                      bool enabled) override;
   void OnPackageAdded(arc::mojom::ArcPackageInfoPtr package_info) override;
   void OnPackageModified(arc::mojom::ArcPackageInfoPtr package_info) override;
   void OnPackageListRefreshed(
       std::vector<arc::mojom::ArcPackageInfoPtr> packages) override;
-  void OnTaskOrientationLockRequested(
-      int32_t task_id,
-      const arc::mojom::OrientationLock orientation_lock) override;
   void OnInstallationStarted(
       const base::Optional<std::string>& package_name) override;
   void OnInstallationFinished(