Do not show shelf or top chrome hints while in Ash immersive mode

ash/common/material_design/material_design_controller.h

Index: ash/common/material_design/material_design_controller.h
diff --git a/ash/common/material_design/material_design_controller.h b/ash/common/material_design/material_design_controller.h
index c15b1ef49649c69b0865daed138193f89f9f0cb7..56adf962f9fcb1def38f3999f0efdbd27a33831c 100644
--- a/ash/common/material_design/material_design_controller.h
+++ b/ash/common/material_design/material_design_controller.h
@@ -43,6 +43,10 @@ class ASH_EXPORT MaterialDesignController {
   // Returns true if Material Design features are enabled for Chrome OS shelf.
   static bool IsShelfMaterial();
 
+  // Returns true if Material Design features are enable for Chrome OS immersive

[James Cook, 2016/09/08 20:33:33]

nit: enable -> enabled

[yiyix, 2016/09/08 22:36:18]

Done.

+  // mode.
+  static bool IsImmersiveModeEnabled();

[James Cook, 2016/09/08 20:33:33]

This should be IsImmersiveModeMaterial(). Right now it sounds like whether or
not the immersive-mode feature itself is enabled.

[yiyix, 2016/09/08 22:36:18]

You are right, this method is poorly named. This name is also used to enable
immersive mode in browser. I took name from the bug description. I wasn't
thinking.

+
   // Returns true if Material Design features are enabled for Chrome OS system
   // tray menu.
   static bool IsSystemTrayMenuMaterial();