arc: Set custom icon in shelf for ARC apps.

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

Index: chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc b/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
index 11032d2c9b43aa5320f6e96f104a30d2836894fb..614d58ce5467ca6bc4f84f634b76541b53aaa5b6 100644
--- a/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
+++ b/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
@@ -27,6 +27,7 @@ void AppWindowLauncherItemController::AddWindow(ui::BaseWindow* app_window) {
   aura::Window* window = app_window->GetNativeWindow();
   if (window)
     observed_windows_.Add(window);
+  UpdateLauncherItem();
 }
 
 AppWindowLauncherItemController::WindowList::iterator
@@ -49,8 +50,8 @@ void AppWindowLauncherItemController::RemoveWindow(ui::BaseWindow* app_window) {
     NOTREACHED();
     return;
   }
-  OnWindowRemoved(app_window);
   windows_.erase(iter);
+  UpdateLauncherItem();
 }
 
 ui::BaseWindow* AppWindowLauncherItemController::GetAppWindow(
@@ -65,6 +66,7 @@ void AppWindowLauncherItemController::SetActiveWindow(aura::Window* window) {
   ui::BaseWindow* app_window = GetAppWindow(window);
   if (app_window)
     last_active_window_ = app_window;
+  UpdateLauncherItem();
 }
 
 AppWindowLauncherItemController*
@@ -119,6 +121,12 @@ void AppWindowLauncherItemController::ActivateIndexedApp(size_t index) {
   ShowAndActivateOrMinimize(*it);
 }
 
+ui::BaseWindow* AppWindowLauncherItemController::GetLastActiveWindow() {
+  if (last_active_window_)
+    return last_active_window_;
+  return windows_.empty() ? nullptr : windows_.front();

[Luis Héctor Chávez, 2017/05/18 18:09:40]

nit:

if (windows_.empty())
  return nullptr
return windows_.front();

[khmel, 2017/05/18 20:27:52]

Done.

[msw, 2017/05/18 22:03:39]

fwiw, I prefer ternary statements, but style preferences aren't too important.

[khmel, 2017/05/18 22:40:02]

Acknowledged.

+}
+
 void AppWindowLauncherItemController::OnWindowPropertyChanged(
     aura::Window* window,
     const void* key,