Add FLAG_trace_maps

Makefile

 # Copyright 2012 the V8 project authors. 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
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 46 matching lines @@
   GYPFLAGS += -Dv8_enable_disassembler=1
 endif
 # objectprint=on
 ifeq ($(objectprint), on)
   GYPFLAGS += -Dv8_object_print=1
 endif
 # verifyheap=on
 ifeq ($(verifyheap), on)
   GYPFLAGS += -Dv8_enable_verify_heap=1
 endif
+# tracemaps=on
+ifeq ($(tracemaps), on)
+  GYPFLAGS += -Dv8_trace_maps=1
+endif
 # backtrace=off
 ifeq ($(backtrace), off)
   GYPFLAGS += -Dv8_enable_backtrace=0
 else
   GYPFLAGS += -Dv8_enable_backtrace=1
 endif
 # verifypredictable=on
 ifeq ($(verifypredictable), on)
   GYPFLAGS += -Dv8_enable_verify_predictable=1
 endif
@@ skipping 421 matching lines @@
               third_party/icu --revision 277999 ; \
         fi
         svn checkout --force http://googletest.googlecode.com/svn/trunk \
             testing/gtest --revision 692
         svn checkout --force http://googlemock.googlecode.com/svn/trunk \
             testing/gmock --revision 485
 
 dependencies: builddeps
         # The spec is a copy of the hooks in v8's DEPS file.
         gclient sync -r fb782d4369d5ae04f17a2fceef7de5a63e50f07b --spec="solutions = [{u'managed': False, u'name': u'buildtools', u'url': u'https://chromium.googlesource.com/chromium/buildtools.git', u'custom_deps': {}, u'custom_hooks': [{u'name': u'clang_format_win',u'pattern': u'.',u'action': [u'download_from_google_storage',u'--no_resume',u'--platform=win32',u'--no_auth',u'--bucket',u'chromium-clang-format',u'-s',u'buildtools/win/clang-format.exe.sha1']},{u'name': u'clang_format_mac',u'pattern': u'.',u'action': [u'download_from_google_storage',u'--no_resume',u'--platform=darwin',u'--no_auth',u'--bucket',u'chromium-clang-format',u'-s',u'buildtools/mac/clang-format.sha1']},{u'name': u'clang_format_linux',u'pattern': u'.',u'action': [u'download_from_google_storage',u'--no_resume',u'--platform=linux*',u'--no_auth',u'--bucket',u'chromium-clang-format',u'-s',u'buildtools/linux64/clang-format.sha1']}],u'deps_file': u'.DEPS.git', u'safesync_url': u''}]"