Recognize new Operating System: NetBSD

NetBSD is BSD and POSIX-like OS.

BUG=

Review-Url: https://codereview.chromium.org/2195203002
Cr-Commit-Position: refs/heads/master@{#408895}

AUTHORS

@@ -339,6 +339,7 @@ Kai Jiang <jiangkai@gmail.com>
 Kal Conley <kcconley@gmail.com>
 Kalyan Kondapally <kalyan.kondapally@intel.com>
 Kamil Jiwa <kamil.jiwa@gmail.com>
+Kamil Rytarowski <krytarowski@gmail.com>
 Kangil Han <kangil.han@samsung.com>
 Kangyuan Shu <kangyuan.shu@intel.com>
 Kartikey Bhatt <kartikey@amazon.com>

PRESUBMIT.py

@@ -311,6 +311,7 @@ _VALID_OS_MACROS = (
     'OS_NACL',
     'OS_NACL_NONSFI',
     'OS_NACL_SFI',
+    'OS_NETBSD',
     'OS_OPENBSD',
     'OS_POSIX',
     'OS_QNX',

build/build_config.h

@@ -51,6 +51,8 @@
 #define TOOLKIT_VIEWS 1
 #elif defined(__FreeBSD__)
 #define OS_FREEBSD 1
+#elif defined(__NetBSD__)
+#define OS_NETBSD 1
 #elif defined(__OpenBSD__)
 #define OS_OPENBSD 1
 #elif defined(__sun)
@@ -67,15 +69,16 @@
 
 // For access to standard BSD features, use OS_BSD instead of a
 // more specific macro.
-#if defined(OS_FREEBSD) || defined(OS_OPENBSD)
+#if defined(OS_FREEBSD) || defined(OS_NETBSD) || defined(OS_OPENBSD)
 #define OS_BSD 1
 #endif
 
 // For access to standard POSIXish features, use OS_POSIX instead of a
 // more specific macro.
 #if defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_FREEBSD) ||     \
-    defined(OS_OPENBSD) || defined(OS_SOLARIS) || defined(OS_ANDROID) ||  \
-    defined(OS_NACL) || defined(OS_QNX)
+    defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_SOLARIS) ||   \
+    defined(OS_ANDROID) || defined(OS_OPENBSD) || defined(OS_SOLARIS) ||  \
+    defined(OS_ANDROID) || defined(OS_NACL) || defined(OS_QNX)
 #define OS_POSIX 1
 #endif