Make TooltipText and AccessibleName into properties on views::Button.

Bug: 938501
Change-Id: Id9b9e82b5b3c50fa8da4fba8c0b1dedcaca470d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416890Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Wei Li <weili@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808139}

ui/views/controls/button/button.cc

@@ -140,11 +140,19 @@ void Button::SetTooltipText(const base::string16& tooltip_text) {
   tooltip_text_ = tooltip_text;
   OnSetTooltipText(tooltip_text);
   TooltipTextChanged();
+  OnPropertyChanged(&tooltip_text_, kPropertyEffectsNone);
   NotifyAccessibilityEvent(ax::mojom::Event::kTextChanged, true);
 }
 
+base::string16 Button::GetTooltipText() const {
+  return tooltip_text_;
+}
+
 void Button::SetAccessibleName(const base::string16& name) {
+  if (name == accessible_name_)
+    return;
   accessible_name_ = name;
+  OnPropertyChanged(&accessible_name_, kPropertyEffectsNone);
   NotifyAccessibilityEvent(ax::mojom::Event::kTextChanged, true);
 }
 
@@ -599,7 +607,9 @@ DEFINE_ENUM_CONVERTERS(
     {Button::STATE_DISABLED, base::ASCIIToUTF16("STATE_DISABLED")})
 
 BEGIN_METADATA(Button, InkDropHostView)
+ADD_PROPERTY_METADATA(base::string16, AccessibleName)
 ADD_PROPERTY_METADATA(ButtonState, State)
+ADD_PROPERTY_METADATA(base::string16, TooltipText)
 END_METADATA
 
 }  // namespace views

ui/views/controls/button/button.h

@@ -106,6 +106,7 @@ class VIEWS_EXPORT Button : public InkDropHostView,
   void SetFocusForPlatform();
 
   void SetTooltipText(const base::string16& tooltip_text);
+  base::string16 GetTooltipText() const;
 
   int tag() const { return tag_; }
   void set_tag(int tag) { tag_ = tag; }