Add testing/iossim/BUILD.gn to build iossim as host for iOS build.

testing/iossim/iossim.mm

Index: testing/iossim/iossim.mm
diff --git a/testing/iossim/iossim.mm b/testing/iossim/iossim.mm
index e2dfa8b5b93e11245a11f8b97d59f87eb04e8336..a746bc4c03c3043a1f76870ae2f3e4a0cf87e9cb 100644
--- a/testing/iossim/iossim.mm
+++ b/testing/iossim/iossim.mm
@@ -69,10 +69,6 @@ namespace {
 const char* const kUserHomeEnvVariable = "CFFIXED_USER_HOME";
 const char* const kHomeEnvVariable = "HOME";
 
-// Device family codes for iPhone and iPad.
-const int kIPhoneFamily = 1;
-const int kIPadFamily = 2;

[Dirk Pranke, 2016/03/16 01:23:22]

Are these (and the constant on line 113) no longer needed?

[sdefresne, 2016/03/17 10:53:47]

Yeah, they cause compilation about unused const variables when building with gn
(not with gyp as they are build with 'chromium_code' set to 0). Since the
changes were minor, I chose to remove dead code instead of adding
-Wno-unused-const-variables to BUILD.gn config.

-
 // Max number of seconds to wait for the simulator session to start.
 // This timeout must allow time to start up iOS Simulator, install the app
 // and perform any other black magic that is encoded in the
@@ -110,7 +106,6 @@ const int kExitInvalidArguments = 2;
 const int kExitInitializationFailure = 3;
 const int kExitAppFailedToStart = 4;
 const int kExitAppCrashed = 5;
-const int kExitUnsupportedXcodeVersion = 6;
 
 void LogError(NSString* format, ...) {
   va_list list;