Add a dialog for getting user consent in the echo redeem flow.

ui/views/controls/styled_label.h

Index: ui/views/controls/styled_label.h
diff --git a/ui/views/controls/styled_label.h b/ui/views/controls/styled_label.h
index 3b683d2e4903e992c1ac7be3438df91db6924d37..80764ed562bb3e0fd1fa67917b30c1189d45dae5 100644
--- a/ui/views/controls/styled_label.h
+++ b/ui/views/controls/styled_label.h
@@ -31,8 +31,13 @@ class VIEWS_EXPORT StyledLabel : public View, public LinkListener {
   // Marks the given range within |text_| as a link.
   void AddLink(const ui::Range& range);
 
+  // Resizes the label to the given width and height big enough to display the
+  // label text.
+  void SizeToFit(int width);
+
   // View implementation:
   virtual gfx::Insets GetInsets() const OVERRIDE;
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual int GetHeightForWidth(int w) OVERRIDE;
   virtual void Layout() OVERRIDE;