Call SetApplicationIsDaemon() in V2 sandbox.

content/common/sandbox_init_mac.h

Index: content/common/sandbox_init_mac.h
diff --git a/content/common/sandbox_init_mac.h b/content/common/sandbox_init_mac.h
index 8f860efd048daa9196d88e82c5e573ee6ab62b24..375b3d992db17e7fc93c74ee841d37e86840f0dd 100644
--- a/content/common/sandbox_init_mac.h
+++ b/content/common/sandbox_init_mac.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_COMMON_SANDBOX_INIT_MAC_H_
 #define CONTENT_COMMON_SANDBOX_INIT_MAC_H_
 
+#include "base/callback_forward.h"
+
 namespace content {
 
 // Initialize the sandbox for renderer, gpu, utility, worker, and plugin
@@ -15,6 +17,10 @@ namespace content {
 // returned.
 bool InitializeSandbox();
 
+// Initializes the sandbox, as described above, but executes the callback after
+// warmup and before initialization.
+bool InitializeSandboxWithPostWarmupHook(base::OnceClosure hook);
+
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SANDBOX_INIT_MAC_H_