Changes view manager to report visibility and drawn state

mojo/services/view_manager/server_view.h

Index: mojo/services/view_manager/server_view.h
diff --git a/mojo/services/view_manager/server_view.h b/mojo/services/view_manager/server_view.h
index 1895ee9a595c58571860eab73f70fb89ce0d6a04..b812afccb3597eac78d6412a6132f65d79e13dfc 100644
--- a/mojo/services/view_manager/server_view.h
+++ b/mojo/services/view_manager/server_view.h
@@ -53,6 +53,7 @@ class MOJO_VIEW_MANAGER_EXPORT ServerView {
   std::vector<const ServerView*> GetChildren() const;
   std::vector<ServerView*> GetChildren();
 
+  // Returns true if this contains |view| or is |view|.
   bool Contains(const ServerView* view) const;
 
   // Returns true if the window is visible. This does not consider visibility
@@ -60,6 +61,10 @@ class MOJO_VIEW_MANAGER_EXPORT ServerView {
   bool visible() const { return visible_; }
   void SetVisible(bool value);
 
+  // Returns true if this view is attached to |root| and all ancestors are
+  // visible.
+  bool IsDrawn(const ServerView* root) const;
+
   void SetBitmap(const SkBitmap& contents);
   const SkBitmap& bitmap() const { return bitmap_; }