Introduce OS_NACL_SFI and OS_NACL_NONSFI macros.

PNaCl toolchain starts to support "Non-SFI build binary" mode.
Some sources are built both for SFI binary and for Non-SFI binary, but, in some
cases, there are small diffs which need to be guarded by #ifdef.
In "Non-SFI build binary" mode, __native_client_nonsfi__ is defined.
This CL introduce OS_NACL_SFI and OS_NACL_NONSFI which can be used among the
chrome code, to slightly simplify the #ifdef conditions.

This CL is the follow up of crrev.com/659243002

BUG=358465
TEST=Ran trybot.

Review URL: https://codereview.chromium.org/664373003

Cr-Original-Commit-Position: refs/heads/master@{#301603}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f7295f2e7b0c17a7784f23e06b924ab966fea3a8

build_config.h

@@ -4,7 +4,8 @@
 
 // This file adds defines about the platform we're currently building on.
 //  Operating System:
-//    OS_WIN / OS_MACOSX / OS_LINUX / OS_POSIX (MACOSX or LINUX) / OS_NACL
+//    OS_WIN / OS_MACOSX / OS_LINUX / OS_POSIX (MACOSX or LINUX) /
+//    OS_NACL (NACL_SFI or NACL_NONSFI) / OS_NACL_SFI / OS_NACL_NONSFI
 //  Compiler:
 //    COMPILER_MSVC / COMPILER_GCC
 //  Processor:
@@ -18,6 +19,14 @@
 #if defined(__native_client__)
 // __native_client__ must be first, so that other OS_ defines are not set.
 #define OS_NACL 1
+// OS_NACL comes in two sandboxing technology flavors, SFI or Non-SFI.
+// PNaCl toolchain defines __native_client_nonsfi__ macro in Non-SFI build
+// mode, while it does not in SFI build mode.
+#if defined(__native_client_nonsfi__)
+#define OS_NACL_NONSFI
+#else
+#define OS_NACL_SFI
+#endif
 #elif defined(ANDROID)
 #define OS_ANDROID 1
 #elif defined(__APPLE__)