[MacViews] Implement AlwaysOnTop and VisibleOnAllWorkspaces.

ui/gfx/mac/nswindow_frame_controls.h

Index: ui/gfx/mac/nswindow_frame_controls.h
diff --git a/ui/gfx/mac/nswindow_frame_controls.h b/ui/gfx/mac/nswindow_frame_controls.h
index 7ec7ab7ee0f6b7aecb549f422c51682a4d218c55..ca17c67941d054ece05b5e7dd507aa8c955f62de 100644
--- a/ui/gfx/mac/nswindow_frame_controls.h
+++ b/ui/gfx/mac/nswindow_frame_controls.h
@@ -17,6 +17,18 @@ class Size;
 GFX_EXPORT void SetNSWindowCanFullscreen(NSWindow* window,
                                          bool allow_fullscreen);
 
+// Returns whether the window is always-on-top.
+GFX_EXPORT bool IsNSWindowAlwaysOnTop(NSWindow* window);
+
+// Sets whether the window is always-on-top. If the window is |transient| it

[tapted, 2015/05/12 04:05:35]

nit: update comment (wrt transient).

[jackhou1, 2015/05/12 05:44:19]

Done.

+// will not appear in Expose and cannot be moved between workspaces.
+GFX_EXPORT void SetNSWindowAlwaysOnTop(NSWindow* window,
+                                       bool always_on_top);
+
+// Sets whether the window appears on all workspaces.
+GFX_EXPORT void SetNSWindowVisibleOnAllWorkspaces(NSWindow* window,
+                                                  bool always_visible);
+
 // Sets the min/max size of the window as well as showing/hiding resize,
 // maximize, and fullscreen controls.
 // Sizes refer to the content size (inner bounds).