Add possibility to ignore unregistered crash keys. Use this from WebView

base/debug/crash_logging.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_DEBUG_CRASH_LOGGING_H_
 #define BASE_DEBUG_CRASH_LOGGING_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 92 matching lines @@
   size_t max_length;
 };
 
 // Before the crash key logging mechanism can be used, all crash keys must be
 // registered with this function. The function returns the amount of space
 // the crash reporting implementation should allocate space for the registered
 // crash keys. |chunk_max_length| is the maximum size that a value in a single
 // chunk can be.
 BASE_EXPORT size_t InitCrashKeys(const CrashKey* const keys, size_t count,
                                  size_t chunk_max_length);
+// Some clients need to log a sub-set of the crash-keys added by lower layers,
+// |ignore_unregistered_keys| allows clients to ignore any keys that haven't
+// been explicitly registered.
+BASE_EXPORT size_t InitCrashKeys(const CrashKey* const keys,
+                                 size_t count,
+                                 size_t chunk_max_length,
+                                 bool ignore_unregistered_keys);
 
 // Returns the corresponding crash key object or NULL for a given key.
 BASE_EXPORT const CrashKey* LookupCrashKey(const base::StringPiece& key);
 
 // In the platform crash reporting implementation, these functions set and
 // clear the NUL-terminated key-value pairs.
 typedef void (*SetCrashKeyValueFuncT)(const base::StringPiece&,
                                       const base::StringPiece&);
 typedef void (*ClearCrashKeyValueFuncT)(const base::StringPiece&);
 
@@ skipping 10 matching lines @@
     const base::StringPiece& value,
     size_t chunk_max_length);
 
 // Resets the crash key system so it can be reinitialized. For testing only.
 BASE_EXPORT void ResetCrashLoggingForTesting();
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_CRASH_LOGGING_H_