iOS HW H264 support.

webrtc/modules/video_coding/codecs/h264/h264_objc.mm

+/*
+ *  Copyright (c) 2015 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.
+ *
+ */
+
+#include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
+
+#if defined(WEBRTC_IOS)
+#import <UIKit/UIKit.h>
+#endif
+
+namespace webrtc {
+
+bool IsH264CodecSupportedObjC() {
+#if defined(WEBRTC_OBJC_H264) && \
+    defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED) && \
+    defined(WEBRTC_IOS)
+  // Supported on iOS8+.
+  return [[[UIDevice currentDevice] systemVersion] doubleValue] >= 8.0;
+#else
+  // TODO(tkchin): Support OS/X once we stop mixing libstdc++ and libc++ on
+  // OSX 10.9.
+  return false;
+#endif
+}
+
+}  // namespace webrtc