Handle app custom icon via aura::Window property.

components/exo/shell_surface.cc

 // Copyright 2015 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 "components/exo/shell_surface.h"
 
 #include <algorithm>
 
 #include "ash/frame/custom_frame_view_ash.h"
 #include "ash/public/cpp/shelf_types.h"
@@ skipping 464 matching lines @@
 
 void ShellSurface::SetTitle(const base::string16& title) {
   TRACE_EVENT1("exo", "ShellSurface::SetTitle", "title",
                base::UTF16ToUTF8(title));
 
   title_ = title;
   if (widget_)
     widget_->UpdateWindowTitle();
 }
 
+void ShellSurface::SetIcon(const gfx::ImageSkia& icon) {
+  TRACE_EVENT0("exo", "ShellSurface::SetIcon");
+
+  icon_ = icon;
+  if (widget_)
+    widget_->UpdateWindowIcon();
+}
+
 void ShellSurface::SetSystemModal(bool system_modal) {
   // System modal container is used by clients to implement client side
   // managed system modal dialogs using a single ShellSurface instance.
   // Hit-test region will be non-empty when at least one dialog exists on
   // the client side. Here we detect the transition between no client side
   // dialog and at least one dialog so activatable state is properly
   // updated.
   if (container_ != ash::kShellWindowId_SystemModalContainer) {
     LOG(ERROR)
         << "Only a window in SystemModalContainer can change the modality";
@@ skipping 317 matching lines @@
 }
 
 bool ShellSurface::CanMinimize() const {
   return can_minimize_;
 }
 
 base::string16 ShellSurface::GetWindowTitle() const {
   return title_;
 }
 
+gfx::ImageSkia ShellSurface::GetWindowIcon() {
+  return icon_;
+}
+
 void ShellSurface::SaveWindowPlacement(const gfx::Rect& bounds,
                                        ui::WindowShowState show_state) {
   if (bounds_mode_ != BoundsMode::CLIENT)
     WidgetDelegate::SaveWindowPlacement(bounds, show_state);
 }
 
 bool ShellSurface::GetSavedWindowPlacement(
     const views::Widget* widget,
     gfx::Rect* bounds,
     ui::WindowShowState* show_state) const {
@@ skipping 836 matching lines @@
 gfx::Point ShellSurface::GetMouseLocation() const {
   aura::Window* const root_window = widget_->GetNativeWindow()->GetRootWindow();
   gfx::Point location =
       root_window->GetHost()->dispatcher()->GetLastMouseLocationInRoot();
   aura::Window::ConvertPointToTarget(
       root_window, widget_->GetNativeWindow()->parent(), &location);
   return location;
 }
 
 }  // namespace exo