[Mac] Add the OS version check functions for 10.8.

base/mac/mac_util.mm

Index: base/mac/mac_util.mm
diff --git a/base/mac/mac_util.mm b/base/mac/mac_util.mm
index 1240906bb7fcd7e12df650b7747831e517eeaf1d..8b011c76abfaa26b62cf9f7a1ff9424bd54f1ec0 100644
--- a/base/mac/mac_util.mm
+++ b/base/mac/mac_util.mm
@@ -554,7 +554,7 @@ int MacOSXMinorVersionInternal() {
   // immediate death.
   CHECK(darwin_major_version >= 6);
   int mac_os_x_minor_version = darwin_major_version - 4;
-  DLOG_IF(WARNING, darwin_major_version > 11) << "Assuming Darwin "
+  DLOG_IF(WARNING, darwin_major_version > 12) << "Assuming Darwin "
       << base::IntToString(darwin_major_version) << " is Mac OS X 10."
       << base::IntToString(mac_os_x_minor_version);
 
@@ -571,7 +571,8 @@ int MacOSXMinorVersion() {
 enum {
   LEOPARD_MINOR_VERSION = 5,
   SNOW_LEOPARD_MINOR_VERSION = 6,
-  LION_MINOR_VERSION = 7
+  LION_MINOR_VERSION = 7,
+  MOUNTAIN_LION_MINOR_VERSION = 8,
 };
 
 }  // namespace
@@ -612,6 +613,12 @@ bool IsOSLion() {
 }
 #endif
 
+#if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GT_10_7)
+bool IsOSLionOrEarlier() {
+  return MacOSXMinorVersion() <= LION_MINOR_VERSION;
+}
+#endif
+
 #if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GE_10_7)
 bool IsOSLionOrLater() {
   return MacOSXMinorVersion() >= LION_MINOR_VERSION;
@@ -624,6 +631,24 @@ bool IsOSLaterThanLion() {
 }
 #endif
 
+#if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GT_10_8)
+bool IsOSMountainLion() {
+  return MacOSXMinorVersion() == MOUNTAIN_LION_MINOR_VERSION;
+}
+#endif
+
+#if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GT_10_8)
+bool IsOSMountainLionOrEarlier() {
+  return MacOSXMinorVersion() <= MOUNTAIN_LION_MINOR_VERSION;
+}
+#endif
+
+#if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GE_10_8)
+bool IsOSMountainLionOrLater() {
+  return MacOSXMinorVersion() >= MOUNTAIN_LION_MINOR_VERSION;
+}
+#endif
+
 namespace {
 
 // ScopedGenericObj functor for IOObjectRelease().