views: impose minimum width on non-Harmony snappables

ui/views/layout/layout_provider.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/layout/layout_provider.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/views/layout/layout_constants.h"
@@ skipping 86 matching lines @@
   }
   NOTREACHED();
   return 0;
 }
 
 const TypographyProvider& LayoutProvider::GetTypographyProvider() const {
   return typography_provider_;
 }
 
 int LayoutProvider::GetSnappedDialogWidth(int min_width) const {
-  return min_width;
+  // This is an arbitrary value, but it's a good arbitrary value. Some dialogs
+  // have very small widths for their contents views, which causes ugly
+  // title-wrapping where a two-word title is split across multiple lines or
+  // similar. To prevent that, forbid any snappable dialog from being narrower
+  // than this value. In principle it's possible to factor in the title width
+  // here, but it is not really worth the complexity.
+  return std::max(min_width, 320);
 }
 
 }  // namespace views