Adjust action button styling in MD notification.

ui/message_center/views/notification_view_md.cc

Index: ui/message_center/views/notification_view_md.cc
diff --git a/ui/message_center/views/notification_view_md.cc b/ui/message_center/views/notification_view_md.cc
index 7a86c5bc7e9e7e2414f81900eaea6e48f5110a06..5426c6f889632a8d1da6236046340d5950f5de7a 100644
--- a/ui/message_center/views/notification_view_md.cc
+++ b/ui/message_center/views/notification_view_md.cc
@@ -6,6 +6,7 @@
 
 #include <stddef.h>
 
+#include "base/i18n/case_conversion.h"
 #include "base/strings/string_util.h"
 #include "ui/base/cursor/cursor.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -221,12 +222,15 @@ void CompactTitleMessageView::OnPaint(gfx::Canvas* canvas) {
 
 // This class is needed in addition to LabelButton mainly becuase we want to set
 // visible_opacity of InkDropHighlight.
+// This button capitalizes the given label string.
 class NotificationButtonMD : public views::LabelButton {
  public:
   NotificationButtonMD(views::ButtonListener* listener,
                        const base::string16& text);
   ~NotificationButtonMD() override;
 
+  void SetText(const base::string16& text) override;
+
   std::unique_ptr<views::InkDropHighlight> CreateInkDropHighlight()
       const override;
 
@@ -236,7 +240,10 @@ class NotificationButtonMD : public views::LabelButton {
 
 NotificationButtonMD::NotificationButtonMD(views::ButtonListener* listener,
                                            const base::string16& text)
-    : views::LabelButton(listener, text, views::style::CONTEXT_BUTTON_MD) {
+    : views::LabelButton(listener,
+                         base::i18n::ToUpper(text),
+                         views::style::CONTEXT_BUTTON_MD) {
+  SetHorizontalAlignment(gfx::ALIGN_CENTER);
   SetInkDropMode(views::LabelButton::InkDropMode::ON);
   set_has_ink_drop_action_on_click(true);
   set_ink_drop_base_color(kActionButtonInkDropBaseColor);
@@ -249,6 +256,10 @@ NotificationButtonMD::NotificationButtonMD(views::ButtonListener* listener,
 
 NotificationButtonMD::~NotificationButtonMD() = default;
 
+void NotificationButtonMD::SetText(const base::string16& text) {
+  views::LabelButton::SetText(base::i18n::ToUpper(text));
+}
+
 std::unique_ptr<views::InkDropHighlight>
 NotificationButtonMD::CreateInkDropHighlight() const {
   std::unique_ptr<views::InkDropHighlight> highlight =