Adds a hide button to the desktop capture notification bar.

chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h

Index: chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h
diff --git a/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h b/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h
index 97126c818162e07ed298d9541d1a17b0d9894fc4..9193da39477a52dad6ae7107c6d18094dffd8630 100644
--- a/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h
+++ b/chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h
@@ -19,11 +19,13 @@
  @private
   base::Closure stop_callback_;
   base::scoped_nsobject<NSButton> stopButton_;
+  base::scoped_nsobject<NSButton> minimizeButton_;
 }
 
 - (id)initWithCallback:(const base::Closure&)stop_callback
                   text:(const base::string16&)text;
 - (void)stopSharing:(id)sender;
+- (void)minimize:(id)sender;
 
 @end