Add progress notification support to new-style notification.

ui/views/controls/progress_bar.h

Index: ui/views/controls/progress_bar.h
diff --git a/ui/views/controls/progress_bar.h b/ui/views/controls/progress_bar.h
index a77d59917ee687b21be6b955f3a283785143de0c..0bb9bf7bf33ae2ef40cf40eba3d2b37a9da13d06 100644
--- a/ui/views/controls/progress_bar.h
+++ b/ui/views/controls/progress_bar.h
@@ -21,7 +21,8 @@ class VIEWS_EXPORT ProgressBar : public View, public gfx::AnimationDelegate {
  public:
   // The preferred height parameter makes it easier to use a ProgressBar with
   // layout managers that size to preferred size.
-  explicit ProgressBar(int preferred_height = 5);
+  explicit ProgressBar(int preferred_height = 5,
+                       bool allow_round_corner = true);
   ~ProgressBar() override;
 
   // Overridden from View:
@@ -60,6 +61,8 @@ class VIEWS_EXPORT ProgressBar : public View, public gfx::AnimationDelegate {
   // In DP, the preferred height of this progress bar.
   const int preferred_height_;
 
+  const bool allow_round_corner_;
+
   std::unique_ptr<gfx::LinearAnimation> indeterminate_bar_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(ProgressBar);