Add percentage of progress in notification header.

ui/message_center/views/notification_header_view.h

Index: ui/message_center/views/notification_header_view.h
diff --git a/ui/message_center/views/notification_header_view.h b/ui/message_center/views/notification_header_view.h
index b5fbbc0aa3f3f142394766ade6e3d18d8236918c..640f6be47f62f4db7c77934f5f10517dbb2da419 100644
--- a/ui/message_center/views/notification_header_view.h
+++ b/ui/message_center/views/notification_header_view.h
@@ -22,11 +22,13 @@ class NotificationHeaderView : public views::CustomButton {
   NotificationHeaderView(views::ButtonListener* listener);
   void SetAppIcon(const gfx::ImageSkia& img);
   void SetAppName(const base::string16& name);
+  void SetProgress(int progress);
   void SetExpandButtonEnabled(bool enabled);
   void SetExpanded(bool expanded);
   void SetSettingsButtonEnabled(bool enabled);
   void SetCloseButtonEnabled(bool enabled);
   void SetControlButtonsVisible(bool visible);
+  void ClearProgress();
   bool IsExpandButtonEnabled();
   bool IsSettingsButtonEnabled();
   bool IsCloseButtonEnabled();
@@ -38,8 +40,11 @@ class NotificationHeaderView : public views::CustomButton {
 
  private:
   void UpdateControlButtonsVisibility();
+  void UpdateSummaryTextVisibility();
 
   views::Label* app_name_view_ = nullptr;
+  views::Label* summary_text_divider_ = nullptr;
+  views::Label* summary_text_view_ = nullptr;
   views::ImageView* app_icon_view_ = nullptr;
   views::ImageButton* expand_button_ = nullptr;
   PaddedButton* settings_button_ = nullptr;
@@ -48,6 +53,7 @@ class NotificationHeaderView : public views::CustomButton {
   bool settings_button_enabled_ = false;
   bool close_button_enabled_ = false;
   bool is_control_buttons_visible_ = false;
+  bool has_summary_text_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationHeaderView);
 };