[WIP] ash/extensions: Add experimental extension support for window-management in ash.

ash/wm/window_util.cc

Index: ash/wm/window_util.cc
diff --git a/ash/wm/window_util.cc b/ash/wm/window_util.cc
index 070015156c7116ddf09b021e3b827ed8d1c10330..2244cb99f9542f96eb7c6c3376ec8de365ead674 100644
--- a/ash/wm/window_util.cc
+++ b/ash/wm/window_util.cc
@@ -62,24 +62,24 @@ bool CanActivateWindow(aura::Window* window) {
   return client && client->CanActivateWindow(window);
 }
 
-bool IsWindowNormal(aura::Window* window) {
+bool IsWindowNormal(const aura::Window* window) {
   return window->GetProperty(aura::client::kShowStateKey) ==
           ui::SHOW_STATE_NORMAL ||
       window->GetProperty(aura::client::kShowStateKey) ==
           ui::SHOW_STATE_DEFAULT;
 }
 
-bool IsWindowMaximized(aura::Window* window) {
+bool IsWindowMaximized(const aura::Window* window) {
   return window->GetProperty(aura::client::kShowStateKey) ==
       ui::SHOW_STATE_MAXIMIZED;
 }
 
-bool IsWindowMinimized(aura::Window* window) {
+bool IsWindowMinimized(const aura::Window* window) {
   return window->GetProperty(aura::client::kShowStateKey) ==
       ui::SHOW_STATE_MINIMIZED;
 }
 
-bool IsWindowFullscreen(aura::Window* window) {
+bool IsWindowFullscreen(const aura::Window* window) {
   return window->GetProperty(aura::client::kShowStateKey) ==
       ui::SHOW_STATE_FULLSCREEN;
 }