Handle app custom icon via aura::Window property.

chrome/browser/ui/ash/launcher/arc_app_window.cc

Index: chrome/browser/ui/ash/launcher/arc_app_window.cc
diff --git a/chrome/browser/ui/ash/launcher/arc_app_window.cc b/chrome/browser/ui/ash/launcher/arc_app_window.cc
index d47bf54ef72a1e9207b9945d97a8d38faac75b99..ca8db03b9dfaefcaa42227bf8b35f75effdc83ce 100644
--- a/chrome/browser/ui/ash/launcher/arc_app_window.cc
+++ b/chrome/browser/ui/ash/launcher/arc_app_window.cc
@@ -33,8 +33,6 @@ void ArcAppWindow::SetController(
     ArcAppWindowLauncherItemController* controller) {
   DCHECK(!controller_ || !controller);
   controller_ = controller;
-  if (controller_)
-    controller_->UpdateLauncherItem();
 }
 
 void ArcAppWindow::SetFullscreenMode(FullScreenMode mode) {
@@ -49,7 +47,7 @@ void ArcAppWindow::SetDescription(
     GetNativeWindow()->SetTitle(base::UTF8ToUTF16(title));
   ImageDecoder::Cancel(this);
   if (unsafe_icon_data_png.empty()) {
-    ResetIcon();
+    SetIcon(gfx::ImageSkia());
     return;
   }
 
@@ -157,21 +155,20 @@ void ArcAppWindow::SetAlwaysOnTop(bool always_on_top) {
   NOTREACHED();
 }
 
-void ArcAppWindow::ResetIcon() {
-  if (icon_.isNull())
+void ArcAppWindow::SetIcon(const gfx::ImageSkia& icon) {
+  if (!exo::ShellSurface::GetMainSurface(GetNativeWindow()))
     return;
-  icon_ = gfx::ImageSkia();
-  if (controller_)
-    controller_->UpdateLauncherItem();
+  exo::ShellSurface* shell_surface = static_cast<exo::ShellSurface*>(
+      widget_->widget_delegate()->GetContentsView());
+  if (!shell_surface)
+    return;
+  shell_surface->SetIcon(icon);
 }
 
 void ArcAppWindow::OnImageDecoded(const SkBitmap& decoded_image) {
-  // TODO(khmel): Use aura::Window property http://crbug.com/724292
-  icon_ = gfx::ImageSkiaOperations::CreateResizedImage(
+  SetIcon(gfx::ImageSkiaOperations::CreateResizedImage(
       gfx::ImageSkia(gfx::ImageSkiaRep(decoded_image, 1.0f)),
       skia::ImageOperations::RESIZE_BEST,
       gfx::Size(extension_misc::EXTENSION_ICON_SMALL,
-                extension_misc::EXTENSION_ICON_SMALL));
-  if (controller_)
-    controller_->UpdateLauncherItem();
+                extension_misc::EXTENSION_ICON_SMALL)));
 }