Change OOMs to raise custom exception rather than breakpoint on Windows.

base/process/memory.h

 // Copyright (c) 2013 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_PROCESS_MEMORY_H_
 #define BASE_PROCESS_MEMORY_H_
 
 #include <stddef.h>
 
 #include "base/base_export.h"
@@ skipping 30 matching lines @@
 // This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will
 // prefer to kill certain process types over others. The range for the
 // adjustment is [-1000, 1000], with [0, 1000] being user accessible.
 // If the Linux system doesn't support the newer oom_score_adj range
 // of [0, 1000], then we revert to using the older oom_adj, and
 // translate the given value into [0, 15].  Some aliasing of values
 // may occur in that case, of course.
 BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score);
 #endif
 
+#if defined(OS_WIN)
+namespace win {
+
+// Custom exception code chosen to indicate an out of memory error.
+// See https://msdn.microsoft.com/en-us/library/het71c37.aspx.
+// "To make sure that you do not define a code that conflicts with an existing
+// exception code" ... "The resulting error code should therefore have the
+// highest four bits set to hexadecimal E."
+// 0xe0000008 was chosen arbitrarily, as 0x00000008 is ERROR_NOT_ENOUGH_MEMORY.
+const DWORD kOomExceptionCode = 0xe0000008;
+
+}  // namespace win
+#endif
+
 // Special allocator functions for callers that want to check for OOM.
 // These will not abort if the allocation fails even if
 // EnableTerminationOnOutOfMemory has been called.
 // This can be useful for huge and/or unpredictable size memory allocations.
 // Please only use this if you really handle the case when the allocation
 // fails. Doing otherwise would risk security.
 // These functions may still crash on OOM when running under memory tools,
 // specifically ASan and other sanitizers.
 // Return value tells whether the allocation succeeded. If it fails |result| is
 // set to NULL, otherwise it holds the memory address.
 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size,
                                                     void** result);
 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedCalloc(size_t num_items,
                                                     size_t size,
                                                     void** result);
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_MEMORY_H_