New function IsRunningOnIOS8OrLater

Similar to IsRunningOnIOS7OrLater except that it checks for
iOS 8 or later.

BUG=None

Review URL: https://codereview.chromium.org/604763002

Cr-Commit-Position: refs/heads/master@{#296710}

base/ios/ios_util.h

@@ -14,6 +14,9 @@ namespace ios {
 // Returns whether the operating system is iOS 7 or later.
 BASE_EXPORT bool IsRunningOnIOS7OrLater();
 
+// Returns whether the operating system is iOS 8 or later.
+BASE_EXPORT bool IsRunningOnIOS8OrLater();
+
 // Returns whether the operating system is at the given version or later.
 BASE_EXPORT bool IsRunningOnOrLater(int32 major, int32 minor, int32 bug_fix);
 

base/ios/ios_util.mm

@@ -24,6 +24,10 @@ bool IsRunningOnIOS7OrLater() {
   return IsRunningOnOrLater(7, 0, 0);
 }
 
+bool IsRunningOnIOS8OrLater() {
+  return IsRunningOnOrLater(8, 0, 0);
+}
+
 bool IsRunningOnOrLater(int32 major, int32 minor, int32 bug_fix) {
   static const int32* current_version = OSVersionAsArray();
   int32 version[] = { major, minor, bug_fix };