Invalidate scrollbars when window activity changes if needed

third_party/WebKit/Source/platform/mac/VersionUtilMac.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "config.h"
 #import "platform/mac/VersionUtilMac.h"
 
 #include <sstream>
 #include <string>
 #include <sys/utsname.h>
@@ skipping 40 matching lines @@
 
 // Returns the running system's Mac OS X minor version. This is the |y| value
 // in 10.y or 10.y.z.
 int MacOSXMinorVersion()
 {
     static int minorVersion = MacOSXMinorVersionInternal();
     return minorVersion;
 }
 
 enum {
+    SNOW_LEOPARD_MINOR_VERSION = 6,
     LION_MINOR_VERSION = 7,
     MAVERICKS_MINOR_VERSION = 9,
     YOSEMITE_MINOR_VERSION = 10,
     EL_CAPITAN_MINOR_VERSION = 11,
 };
 
 } // namespace
 
 namespace blink {
 
+bool IsOSSnowLeopard()
+{
+    return MacOSXMinorVersion() == SNOW_LEOPARD_MINOR_VERSION;
+}
+
 bool IsOSLionOrEarlier()
 {
     return MacOSXMinorVersion() <= LION_MINOR_VERSION;
 }
 
 bool IsOSMavericksOrEarlier()
 {
     return MacOSXMinorVersion() <= MAVERICKS_MINOR_VERSION;
 }
 
 bool IsOSMavericks()
 {
     return MacOSXMinorVersion() == MAVERICKS_MINOR_VERSION;
 }
 
 bool IsOSYosemite()
 {
     return MacOSXMinorVersion() == YOSEMITE_MINOR_VERSION;
 }
 
 bool IsOSElCapitan()
 {
     return MacOSXMinorVersion() == EL_CAPITAN_MINOR_VERSION;
 }
 
 } // namespace blink