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diff --git a/third_party/libwebrtc/sdk/objc/native/src/audio/helpers.h b/third_party/libwebrtc/sdk/objc/native/src/audio/helpers.h
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+/*
+ *  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.
+ */
+
+#ifndef SDK_OBJC_NATIVE_SRC_AUDIO_HELPERS_H_
+#define SDK_OBJC_NATIVE_SRC_AUDIO_HELPERS_H_
+
+#import <Foundation/Foundation.h>
+#include <objc/objc.h>
+
+#include <string>
+
+namespace webrtc {
+namespace ios {
+
+bool CheckAndLogError(BOOL success, NSError* error);
+
+NSString* NSStringFromStdString(const std::string& stdString);
+std::string StdStringFromNSString(NSString* nsString);
+
+// Return thread ID as a string.
+std::string GetThreadId();
+
+// Return thread ID as string suitable for debug logging.
+std::string GetThreadInfo();
+
+// Returns [NSThread currentThread] description as string.
+// Example: <NSThread: 0x170066d80>{number = 1, name = main}
+std::string GetCurrentThreadDescription();
+
+#if defined(WEBRTC_IOS)
+// Returns the current name of the operating system.
+std::string GetSystemName();
+
+// Returns the current version of the operating system as a string.
+std::string GetSystemVersionAsString();
+
+// Returns the version of the operating system in double representation.
+// Uses a cached value of the system version.
+double GetSystemVersion();
+
+// Returns the device type.
+// Examples: ”iPhone” and ”iPod touch”.
+std::string GetDeviceType();
+#endif  // defined(WEBRTC_IOS)
+
+// Returns a more detailed device name.
+// Examples: "iPhone 5s (GSM)" and "iPhone 6 Plus".
+std::string GetDeviceName();
+
+// Returns the name of the process. Does not uniquely identify the process.
+std::string GetProcessName();
+
+// Returns the identifier of the process (often called process ID).
+int GetProcessID();
+
+// Returns a string containing the version of the operating system on which the
+// process is executing. The string is string is human readable, localized, and
+// is appropriate for displaying to the user.
+std::string GetOSVersionString();
+
+// Returns the number of processing cores available on the device.
+int GetProcessorCount();
+
+#if defined(WEBRTC_IOS)
+// Indicates whether Low Power Mode is enabled on the iOS device.
+bool GetLowPowerModeEnabled();
+#endif
+
+}  // namespace ios
+}  // namespace webrtc
+
+#endif  // SDK_OBJC_NATIVE_SRC_AUDIO_HELPERS_H_