[Chromecast] Add support for z-order and window focus.

chromecast/graphics/cast_window_manager.h

Index: chromecast/graphics/cast_window_manager.h
diff --git a/chromecast/graphics/cast_window_manager.h b/chromecast/graphics/cast_window_manager.h
index bf2dc4b63f3a292c79bd76465b361db176441208..f39fb7947ee671b6b291b1504ea9265f60095772 100644
--- a/chromecast/graphics/cast_window_manager.h
+++ b/chromecast/graphics/cast_window_manager.h
@@ -18,6 +18,17 @@ namespace chromecast {
 // should exist per platform root window (e.g., in Ozone, one per Ozone window).
 class CastWindowManager {
  public:
+  // Note: these window IDs are ordered by z-order.
+  enum {

[derekjchow1, 2017/01/19 18:12:13]

Where is this enum actually used?

[Joshua LeVasseur, 2017/01/19 19:35:25]

Pending CLs and internal code.

+    BOTTOM = -1,
+    APP = BOTTOM,

[derekjchow1, 2017/01/19 18:12:13]

To mimic line TOP = VOLUME, shouldn't BOTTOM = APP?

[Joshua LeVasseur, 2017/01/19 19:35:25]

That would require APP to be defined first at -1 (-1 is the default window ID
for Aura).  I'd rather have BOTTOM and TOP sandwich the others, for easier
reading.  

+    DEBUG_OVERLAY,
+    INFO_OVERLAY,
+    SOFT_KEYBOARD,
+    VOLUME,
+    TOP = VOLUME
+  } WindowId;
+
   // Creates the platform-specific CastWindowManager.
   static std::unique_ptr<CastWindowManager> Create(bool enable_input);