Fix modules_unittests on iOS.

webrtc/test/testsupport/iosfileutils.mm

 /*
  *  Copyright 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.
  */
 
 #if defined(WEBRTC_IOS)
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import <Foundation/Foundation.h>
 #include <string.h>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 namespace test {
 
 // TODO(henrika): move to shared location.
 // See https://code.google.com/p/webrtc/issues/detail?id=4773 for details.
 NSString* NSStringFromStdString(const std::string& stdString) {

[tkchin_webrtc, 2016/09/27 11:01:47]

fyi these should be eventually deleted and usage should shift to utility classes
in webrtc/sdk/objc

[kthelgason, 2016/09/27 11:10:31]

Yes, I agree. I think there is a bug open for deleting this. I'll open one if
not.

   // std::string may contain null termination character so we construct
   // using length.
   return [[NSString alloc] initWithBytes:stdString.data()
                                   length:stdString.length()
                                 encoding:NSUTF8StringEncoding];
 }
 
 std::string StdStringFromNSString(NSString* nsString) {
   NSData* charData = [nsString dataUsingEncoding:NSUTF8StringEncoding];
   return std::string(reinterpret_cast<const char*>([charData bytes]),
                      [charData length]);
 }
 
 // For iOS, resource files are added to the application bundle in the root
 // and not in separate folders as is the case for other platforms. This method
 // therefore removes any prepended folders and uses only the actual file name.
 std::string IOSResourcePath(std::string name, std::string extension) {
   @autoreleasepool {
     NSString* path = NSStringFromStdString(name);
     NSString* fileName = path.lastPathComponent;
     NSString* fileType = NSStringFromStdString(extension);
     // Get full pathname for the resource identified by the name and extension.
     NSString* pathString = [[NSBundle mainBundle] pathForResource:fileName
                                                            ofType:fileType];
     return StdStringFromNSString(pathString);
   }
 }
 
+std::string IOSRootPath() {
+  @autoreleasepool {
+    NSBundle* mainBundle = [NSBundle mainBundle];
+    return StdStringFromNSString(mainBundle.bundlePath) + "/";
+  }
+}
+
 // For iOS, we don't have access to the output directory. Return the path to the
 // temporary directory instead. This is mostly used by tests that need to write
 // output files to disk.
 std::string IOSOutputPath()  {
   @autoreleasepool {
     NSString* tempDir = NSTemporaryDirectory();
     if (tempDir == nil)
         tempDir = @"/tmp";
     return StdStringFromNSString(tempDir);
   }
 }
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // defined(WEBRTC_IOS)