views: add Harmony dialog width support

ui/views/window/dialog_delegate.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 #define UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
@@ skipping 95 matching lines @@
   // Returns true if this particular dialog should use a Chrome-styled frame
   // like the one used for bubbles. The alternative is a more platform-native
   // frame.
   virtual bool ShouldUseCustomFrame() const;
 
   // A helper for accessing the DialogClientView object contained by this
   // delegate's Window.
   const DialogClientView* GetDialogClientView() const;
   DialogClientView* GetDialogClientView();
 
+  // Returns this dialog's width factor, if it has one. If it does not,
+  // returns zero.
+  int GetWidthFactor() const;

[Evan Stade, 2016/10/05 19:52:29]

I would expect this to either return an int that is the width in px (factor *
32) or an instance of DialogWidth

+
  protected:
   // Overridden from WidgetDelegate:
   ui::AXRole GetAccessibleWindowRole() const override;
 
+  // These values are in the 32px units the Harmony spec uses.

[Evan Stade, 2016/10/05 19:52:29]

a/units/increments

+  enum class DialogWidth {
+    UNSPECIFIED = 0,
+    SMALL = 10,
+    MEDIUM = 14,
+    LARGE = 16,
+  };
+
+  void set_dialog_width(DialogWidth width) { dialog_width_ = width; }
+
  private:
   // A flag indicating whether this dialog is able to use the custom frame
   // style for dialogs.
   bool supports_custom_frame_;
+
+  DialogWidth dialog_width_ = DialogWidth::UNSPECIFIED;
 };
 
 // A DialogDelegate implementation that is-a View. Used to override GetWidget()
 // to call View's GetWidget() for the common case where a DialogDelegate
 // implementation is-a View. Note that DialogDelegateView is not owned by
 // view's hierarchy and is expected to be deleted on DeleteDelegate call.
 class VIEWS_EXPORT DialogDelegateView : public DialogDelegate,
                                         public View {
  public:
   DialogDelegateView();
@@ skipping 10 matching lines @@
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_