Reland of Split iOS sdk in to separate targets

webrtc/sdk/objc/Framework/Classes/Common/RTCUIApplication.h

Index: webrtc/sdk/objc/Framework/Classes/Common/RTCUIApplication.h
diff --git a/webrtc/sdk/objc/Framework/Classes/Common/RTCUIApplication.h b/webrtc/sdk/objc/Framework/Classes/Common/RTCUIApplication.h
new file mode 100644
index 0000000000000000000000000000000000000000..3df6d530b8f15bac2429acab8e08db2fa24d24ed
--- /dev/null
+++ b/webrtc/sdk/objc/Framework/Classes/Common/RTCUIApplication.h
@@ -0,0 +1,21 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_UI_RTCUIAPPLICATION_H_
+#define WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_UI_RTCUIAPPLICATION_H_
+
+#include "WebRTC/RTCMacros.h"
+
+#if defined(WEBRTC_IOS)
+/** Convenience function to get UIApplicationState from C++. */
+RTC_EXTERN bool RTCIsUIApplicationActive();
+#endif  // WEBRTC_IOS
+
+#endif  // WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_UI_RTCUIAPPLICATION_H_