MacViews: Exploring removal of window-modal sheets.

chrome/browser/ui/cocoa/web_contents_modal_dialog_host_cocoa.h

Index: chrome/browser/ui/cocoa/web_contents_modal_dialog_host_cocoa.h
diff --git a/chrome/browser/ui/cocoa/web_contents_modal_dialog_host_cocoa.h b/chrome/browser/ui/cocoa/web_contents_modal_dialog_host_cocoa.h
index d1e0e4106675e5b5d04e2b1407d4de68d14d32ee..b6dc754132134c9d55a85ae3217c5954d8001735 100644
--- a/chrome/browser/ui/cocoa/web_contents_modal_dialog_host_cocoa.h
+++ b/chrome/browser/ui/cocoa/web_contents_modal_dialog_host_cocoa.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_UI_COCOA_WEB_CONTENTS_DIALOG_HOST_COCOA_H_
 
 #include "base/macros.h"
+#include "base/observer_list.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 
 @class ConstrainedWindowSheetController;
@@ -19,9 +20,12 @@ class WebContentsModalDialogHostCocoa
       ConstrainedWindowSheetController* sheet_controller);
   ~WebContentsModalDialogHostCocoa() override;
 
+  void OnPositionRequiresUpdate();
+
   // web_modal::ModalDialogHost:
   gfx::NativeView GetHostView() const override;
   gfx::Point GetDialogPosition(const gfx::Size& size) override;
+  gfx::Point GetHostPosition() const override;
   void AddObserver(web_modal::ModalDialogHostObserver* observer) override;
   void RemoveObserver(web_modal::ModalDialogHostObserver* observer) override;
 
@@ -30,6 +34,7 @@ class WebContentsModalDialogHostCocoa
 
  private:
   ConstrainedWindowSheetController* sheet_controller_;  // Weak. Owns |this|.
+  base::ObserverList<web_modal::ModalDialogHostObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsModalDialogHostCocoa);
 };