Reland of Injectable Obj-C video codecs

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

 /*
  *  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 WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_COMMON_HELPERS_H_
 #define WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_COMMON_HELPERS_H_
 
-#if defined(WEBRTC_IOS)
-
 #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  // defined(WEBRTC_IOS)
-
 #endif  // WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_COMMON_HELPERS_H_