Add CrAppProtocol for headless on Mac

headless/lib/browser/headless_shell_application_mac.h

Index: headless/lib/browser/headless_shell_application_mac.h
diff --git a/headless/lib/browser/headless_shell_application_mac.h b/headless/lib/browser/headless_shell_application_mac.h
new file mode 100644
index 0000000000000000000000000000000000000000..6c15493095c82f881be66cf923d99a57a9c2f386
--- /dev/null
+++ b/headless/lib/browser/headless_shell_application_mac.h
@@ -0,0 +1,25 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef HEADLESS_LIB_BROWSER_HEADLESS_SHELL_APPLICATION_MAC_H_
+#define HEADLESS_LIB_BROWSER_HEADLESS_SHELL_APPLICATION_MAC_H_
+
+#include "base/mac/scoped_sending_event.h"
+#include "base/message_loop/message_pump_mac.h"
+
+@interface HeadlessShellCrApplication

[Eric Seckler, 2017/03/14 08:27:53]

Can we add a comment somewhere why we need this NsApp subclass? Why do we need
to "handle" events (by dropping them?) for screenshots?

[dvallet, 2017/03/15 03:49:00]

Done. I've also removed some unnecessary function, although I think I'll have to
add them later.

+    : NSApplication<CrAppProtocol, CrAppControlProtocol> {
+  @private
+  BOOL handlingSendEvent_;

[Robert Sesek, 2017/03/14 13:11:24]

Since this is new ObjC code, it should be written in the modern style: you can
move the ivar into the .mm file to hide it.

[dvallet, 2017/03/15 03:49:00]

Done. Thanks for checking!

+}
+
+// CrAppProtocol:
+- (BOOL)isHandlingSendEvent;
+
+// CrAppControlProtocol:
+- (void)setHandlingSendEvent:(BOOL)handlingSendEvent;
+
+@end
+
+#endif  // HEADLESS_LIB_BROWSER_HEADLESS_SHELL_APPLICATION_MAC_H_