[Mac] Log stack trace for CHECK in bug 97285.

base/mac/crash_logging.h

Index: base/mac/crash_logging.h
diff --git a/base/mac/crash_logging.h b/base/mac/crash_logging.h
index ea28ce56a806ca9ef306397dfb3c62cdd422bbee..7e83eaec536c47ad41dba77d66af9ae86e642656 100644
--- a/base/mac/crash_logging.h
+++ b/base/mac/crash_logging.h
@@ -32,6 +32,13 @@ BASE_EXPORT void SetCrashKeyFunctions(SetCrashKeyValueFuncPtr set_key_func,
 BASE_EXPORT void SetCrashKeyValue(NSString* key, NSString* val);
 BASE_EXPORT void ClearCrashKey(NSString* key);
 
+// Format |count| items from |addresses| using %p, and set the
+// resulting string as value for crash key |key|.  A maximum of 23
+// items will be encoded, since breakpad limits values to 255 bytes.
+BASE_EXPORT void SetCrashKeyFromAddresses(NSString* key,
+                                          const void* const* addresses,
+                                          size_t count);
+
 #if __OBJC__
 
 class BASE_EXPORT ScopedCrashKey {