Adds support for webrtc::test::ResourcePath on iOS

webrtc/test/testsupport/fileutils.cc

Index: webrtc/test/testsupport/fileutils.cc
diff --git a/webrtc/test/testsupport/fileutils.cc b/webrtc/test/testsupport/fileutils.cc
index 8301e77165d2e1e2d4214db876b9d7fd413bb99e..79abdf281983f502c305618774118a7021dbf271 100644
--- a/webrtc/test/testsupport/fileutils.cc
+++ b/webrtc/test/testsupport/fileutils.cc
@@ -38,6 +38,11 @@
 
 #include "webrtc/typedefs.h"  // For architecture defines
 
+#if defined(WEBRTC_IOS)
+// Defined in iosfileutils.mm.  No header file to discourage use elsewhere.
+std::string IOSResourcePath(std::string name, std::string extension);
+#endif
+
 namespace webrtc {
 namespace test {
 
@@ -205,6 +210,10 @@ bool CreateDir(std::string directory_name) {
 }
 
 std::string ResourcePath(std::string name, std::string extension) {
+#if defined (WEBRTC_IOS)
+  return IOSResourcePath(name, extension);

[henrika_webrtc, 2015/06/11 11:02:34]

I should add comments here about what's unique for iOS. File is placed in root
of app bundle etc.

[tkchin_webrtc, 2015/06/12 01:30:26]

Probably add it to header file function comments.
Will this cause compiler warning that rest of code is unreachable?

[henrika_webrtc, 2015/06/12 12:52:11]

I followed the existing style in unixfilesystem.cc in webrtc/base where an
mm-file is used without header. There are now compile warnings as is. Will add
comments in mm file. Not sure how to mix include and import.

[tkchin_webrtc, 2015/06/12 17:43:35]

What compiler warnings are you referring to? I meant that because rest of code
isn't ifdef-ed out, you get something that looks like

  return ...;
  std::string resources_path = ...;
  ...
  return resources_path + name + "." + extension.

The style of private extern makes sense to me. I would namespace the function
under webrtc::test though.

[henrika_webrtc, 2015/06/15 08:46:29]

Bad spelling in first version, I did *not* get any compile warnings. But see
your point. Did changes.

+#endif  // defined (WEBRTC_IOS)
+
   std::string platform = "win";
 #ifdef WEBRTC_LINUX
   platform = "linux";