[Mac] Implement base::EnableTerminationOnHeapCorruption() by overriding malloc_error_break().

base/process_util_unittest.cc

Index: base/process_util_unittest.cc
diff --git a/base/process_util_unittest.cc b/base/process_util_unittest.cc
index 3b05d03a0661a5e1b62c51bda81c7f513b6fa5b6..8a653d4c04c14540590ec21365c8f18cbecc58dd 100644
--- a/base/process_util_unittest.cc
+++ b/base/process_util_unittest.cc
@@ -397,6 +397,21 @@ TEST_F(ProcessUtilTest, LaunchAsUser) {
 
 #endif  // defined(OS_WIN)
 
+#if defined(OS_MACOSX)
+
+TEST_F(ProcessUtilTest, MacTerminateOnHeapCorruption) {
+  // Note that base::EnableTerminationOnHeapCorruption() is called as part of
+  // test suite setup and does not need to be done again, else mach_override
+  // will fail.
+
+  char buf[3];
+  ASSERT_DEATH(free(buf), "being freed.*"
+      "\\*\\*\\* set a breakpoint in malloc_error_break to debug.*"
+      "Terminating process due to a potential for future heap corruption");
+}
+
+#endif  // defined(OS_MACOSX)
+
 #if defined(OS_POSIX)
 
 namespace {