Limit constrained windows to the size of the parent view.

components/web_modal/web_contents_modal_dialog_host.h

Index: components/web_modal/web_contents_modal_dialog_host.h
diff --git a/components/web_modal/web_contents_modal_dialog_host.h b/components/web_modal/web_contents_modal_dialog_host.h
index b14c6e85afdd5d112911842d2c84d2e7dc5e7ffb..73a3a7a0da68c84310ea4a5cca67c21ed9638783 100644
--- a/components/web_modal/web_contents_modal_dialog_host.h
+++ b/components/web_modal/web_contents_modal_dialog_host.h
@@ -6,8 +6,11 @@
 #define COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
 
 #include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/point.h"
-#include "ui/gfx/size.h"
+
+namespace gfx {
+class Point;
+class Size;
+}
 
 namespace web_modal {
 
@@ -39,6 +42,9 @@ class WebContentsModalDialogHost {
   // view.
   virtual gfx::Point GetDialogPosition(const gfx::Size& size) = 0;
 
+  // Returns the maximum dimensions a dialog can have.
+  virtual gfx::Size GetMaximumDialogSize() = 0;
+
   // Add/remove observer.
   virtual void AddObserver(WebContentsModalDialogHostObserver* observer) = 0;
   virtual void RemoveObserver(WebContentsModalDialogHostObserver* observer) = 0;