Update to Chromium //base at Chromium commit 3e81715e6d3a4324362635aea46ce1f1a163cca1.

debug/debugger_posix.cc

 // 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.
 
 #include "base/debug/debugger.h"
 #include "build/build_config.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ skipping 17 matching lines @@
 #include <sys/sysctl.h>
 #endif
 
 #if defined(OS_FREEBSD)
 #include <sys/user.h>
 #endif
 
 #include <ostream>
 
 #include "base/basictypes.h"
+#include "base/debug/alias.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/strings/string_piece.h"
 
 #if defined(USE_SYMBOLIZE)
 #include "base/third_party/symbolize/symbolize.h"
 #endif
 
 #if defined(OS_ANDROID)
@@ skipping 182 matching lines @@
 #elif defined(DEBUG_BREAK_ASM)
 #define DEBUG_BREAK() DEBUG_BREAK_ASM()
 #else
 #error "Don't know how to debug break on this architecture/OS"
 #endif
 
 void BreakDebugger() {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
 
+  // Linker's ICF feature may merge this function with other functions with the
+  // same definition (e.g. any function whose sole job is to call abort()) and
+  // it may confuse the crash report processing system. http://crbug.com/508489
+  static int static_variable_to_make_this_function_unique = 0;
+  base::debug::Alias(&static_variable_to_make_this_function_unique);
+
   DEBUG_BREAK();
 #if defined(OS_ANDROID) && !defined(OFFICIAL_BUILD)
   // For Android development we always build release (debug builds are
   // unmanageably large), so the unofficial build is used for debugging. It is
   // helpful to be able to insert BreakDebugger() statements in the source,
   // attach the debugger, inspect the state of the program and then resume it by
   // setting the 'go' variable above.
 #elif defined(NDEBUG)
   // Terminate the program after signaling the debug break.
   _exit(1);
 #endif
 }
 
 }  // namespace debug
 }  // namespace base