restore LOG_FATAL crash key on windows

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index 0771b47c182e5c18c868f1124a0784bf411d74a9..303d820733e242fd1a65f63f2433e119076700e2 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -53,9 +53,11 @@ typedef pthread_mutex_t* MutexHandle;
 #include <ostream>
 #include <string>
 
+#include "base/auto_reset.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/alias.h"
+#include "base/debug/crash_logging.h"
 #include "base/debug/debugger.h"
 #include "base/debug/stack_trace.h"
 #include "base/posix/eintr_wrapper.h"
@@ -537,6 +539,22 @@ LogMessage::~LogMessage() {
   stream_ << std::endl;
   std::string str_newline(stream_.str());
 
+// NaCl targets do not have base/debug/crash_logging.cc.
+#if !defined(OS_NACL)
+  if (severity_ == LOG_FATAL) {
+    // In case of an out-of-memory condition, this code could be reentered when
+    // constructing and storing the key. Using a static is not thread-safe, but
+    // if multiple threads are in the process of a fatal crash at the same time,
+    // this should work.
+    static bool guarded = false;
+    if (!guarded) {
+      base::AutoReset<bool> guard(&guarded, true);
+      base::debug::SetCrashKeyValue(
+          "LOG_FATAL", base::StringPiece(str_newline.c_str() + message_start_));
+    }
+  }
+#endif  // !defined(OS_NACL)
+
   // Give any log message handler first dibs on the message.
   if (log_message_handler &&
       log_message_handler(severity_, file_, line_,