Fix relaunches on the Mac

base/mac/mac_util.mm

 // Copyright (c) 2011 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.
 
 #include "base/mac/mac_util.h"
 
 #import <Cocoa/Cocoa.h>
 #include <string.h>
 #include <sys/utsname.h>
 
@@ skipping 224 matching lines @@
 void ActivateProcess(pid_t pid) {
   ProcessSerialNumber process;
   OSStatus status = GetProcessForPID(pid, &process);
   if (status == noErr) {
     SetFrontProcess(&process);
   } else {
     LOG(WARNING) << "Unable to get process for pid " << pid;
   }
 }
 
+bool AmIForeground() {
+  ProcessSerialNumber foreground_psn = { 0 };
+  OSErr err = GetFrontProcess(&foreground_psn);
+  if (err != noErr) {
+    LOG(WARNING) << "GetFrontProcess: " << err;
+    return false;
+  }
+
+  ProcessSerialNumber my_psn = { 0, kCurrentProcess };
+
+  Boolean result = FALSE;
+  err = SameProcess(&foreground_psn, &my_psn, &result);
+  if (err != noErr) {
+    LOG(WARNING) << "SameProcess: " << err;
+    return false;
+  }
+
+  return result;
+}
+
 bool SetFileBackupExclusion(const FilePath& file_path) {
   NSString* file_path_ns =
       [NSString stringWithUTF8String:file_path.value().c_str()];
   NSURL* file_url = [NSURL fileURLWithPath:file_path_ns];
 
   // When excludeByPath is true the application must be running with root
   // privileges (admin for 10.6 and earlier) but the URL does not have to
   // already exist. When excludeByPath is false the URL must already exist but
   // can be used in non-root (or admin as above) mode. We use false so that
   // non-root (or admin) users don't get their TimeMachine drive filled up with
@@ skipping 333 matching lines @@
 #endif
 
 #if !defined(BASE_MAC_MAC_UTIL_H_INLINED_GT_10_7)
 bool IsOSLaterThanLion() {
   return MacOSXMinorVersion() > LION_MINOR_VERSION;
 }
 #endif
 
 }  // namespace mac
 }  // namespace base