views: implement dialog width snapping

chrome/browser/ui/views/harmony/layout_delegate.h

Index: chrome/browser/ui/views/harmony/layout_delegate.h
diff --git a/chrome/browser/ui/views/harmony/layout_delegate.h b/chrome/browser/ui/views/harmony/layout_delegate.h
index f0ad07d93382a5f6949ef620eea9680b23ddf526..d17971218c972baf03aa16a8d33bb7c755e9b45e 100644
--- a/chrome/browser/ui/views/harmony/layout_delegate.h
+++ b/chrome/browser/ui/views/harmony/layout_delegate.h
@@ -107,9 +107,9 @@ class LayoutDelegate {
   // TODO(pkasting): Fix callers and remove this.
   virtual bool IsHarmonyMode() const;
 
-  // Returns the preferred width in DIPs for a dialog of the specified |width|.
-  // May return 0 if the dialog has no preferred width.
-  virtual int GetDialogPreferredWidth(DialogWidth width) const;
+  // Returns the preferred width in DIPs for a dialog of the specified
+  // |min_width|. May return 0 if the dialog has no preferred width.

[Peter Kasting, 2017/04/06 06:32:16]

Nit: Comment seems outdated.  Maybe "Returns the actual width to use for a
dialog that requires at least |min_width|.  This may be used to e.g. round up to
a set of fixed widths."

+  virtual int GetSnappedDialogWidth(int min_width) const;
 
   // Returns the class that maps views::style values (TextContext and TextStyle)
   // to specific font properties (e.g. typeface, size, color, line spacing).