Added errno (or GetLastError code) to crash dump when systemAllocPages fails.

third_party/WebKit/Source/wtf/Partitions.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 169 matching lines @@
 
 static NEVER_INLINE void partitionsOutOfMemoryUsing16M()
 {
     size_t signature = 16 * 1024 * 1024;
     base::debug::Alias(&signature);
     IMMEDIATE_CRASH();
 }
 
 static NEVER_INLINE void partitionsOutOfMemoryUsingLessThan16M()
 {
-    size_t signature = 16 * 1024 * 1024 - 1;
+    uint32_t signature = getAllocPageErrorCode();
     base::debug::Alias(&signature);

[sof, 2016/02/23 07:27:25]

If Alias() makes its (aliased) local variable persisted in minidumps, then
perhaps it would make sense to add this use of Alias() one level up to
handleOutOfMemory() ?

[tasak, 2016/02/24 03:53:33]

I see.
Done.

     IMMEDIATE_CRASH();
 }
 
 void Partitions::handleOutOfMemory()
 {
     volatile size_t totalUsage = totalSizeOfCommittedPages();
 
     if (totalUsage >= 2UL * 1024 * 1024 * 1024)
         partitionsOutOfMemoryUsing2G();
     if (totalUsage >= 1UL * 1024 * 1024 * 1024)
         partitionsOutOfMemoryUsing1G();
     if (totalUsage >= 512 * 1024 * 1024)
         partitionsOutOfMemoryUsing512M();
     if (totalUsage >= 256 * 1024 * 1024)
         partitionsOutOfMemoryUsing256M();
     if (totalUsage >= 128 * 1024 * 1024)
         partitionsOutOfMemoryUsing128M();
     if (totalUsage >= 64 * 1024 * 1024)
         partitionsOutOfMemoryUsing64M();
     if (totalUsage >= 32 * 1024 * 1024)
         partitionsOutOfMemoryUsing32M();
     if (totalUsage >= 16 * 1024 * 1024)
         partitionsOutOfMemoryUsing16M();
     partitionsOutOfMemoryUsingLessThan16M();
 }
 
 } // namespace WTF