[MIPS] Add DEBUG_BREAK() for MIPS architecture.

base/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 204 matching lines @@
     volatile int go = 0; \
     while (!go) { \
       base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(100)); \
     } \
   } \
 } while (0)
 #else
 // ARM && !ANDROID
 #define DEBUG_BREAK() asm("bkpt 0")
 #endif
+#elif defined(ARCH_CPU_MIPS_FAMILY)
+#define DEBUG_BREAK() asm("break 2")
 #else
 #define DEBUG_BREAK() asm("int3")
 #endif
 
 void BreakDebugger() {
   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