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

base/mac/mac_util.h

Index: base/mac/mac_util.h
diff --git a/base/mac/mac_util.h b/base/mac/mac_util.h
index 4fefe6c5ee80976d9788193dbd5e1c9b6a2c6d29..3d50d6145285eb14ddec7a3f9c563670e0b8c4c2 100644
--- a/base/mac/mac_util.h
+++ b/base/mac/mac_util.h
@@ -138,11 +138,19 @@ BASE_EXPORT bool IsOSSnowLeopardOrLater();
 
 // Lion is Mac OS X 10.7, Darwin 11.
 BASE_EXPORT bool IsOSLion();
+BASE_EXPORT bool IsOSLionOrEarlier();
 BASE_EXPORT bool IsOSLionOrLater();
 
+// Mountain Lion is Mac OS X 10.8, Darwin 12.
+BASE_EXPORT bool IsOSMountainLion();
+BASE_EXPORT bool IsOSMountainLionOrLater();
+
 // This should be infrequently used. It only makes sense to use this to avoid
 // codepaths that are very likely to break on future (unreleased, untested,
 // unborn) OS releases.
+BASE_EXPORT
+    bool IsOSDangerouslyLaterThanMountainLionForUseByCFAllocatorReplacement();
+// TODO(rsesek|avi): Remove when allocators gonna allocate.
 BASE_EXPORT bool IsOSLaterThanLion();
 
 // When the deployment target is set, the code produced cannot run on earlier
@@ -170,9 +178,26 @@ inline bool IsOSLionOrLater() { return true; }
     MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_7
 #define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_7
 inline bool IsOSLion() { return false; }
+inline bool IsOSLionOrEarlier() { return false; }
 inline bool IsOSLaterThanLion() { return true; }
 #endif
 
+#if defined(MAC_OS_X_VERSION_10_8) && \
+    MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_8
+#define BASE_MAC_MAC_UTIL_H_INLINED_GE_10_8
+inline bool IsOSMountainLionOrLater() { return true; }
+#endif
+
+#if defined(MAC_OS_X_VERSION_10_8) && \
+    MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_8
+#define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_8
+inline bool IsOSMountainLion() { return false; }
+inline bool IsOSDangerouslyLaterThanMountainLionForUseByCFAllocatorReplacement()
+{
+  return true;
+}
+#endif
+
 // Retrieve the system's model identifier string from the IOKit registry:
 // for example, "MacPro4,1", "MacBookPro6,1". Returns empty string upon
 // failure.