Support external startup data in V8. (retry)

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 623 matching lines @@
               "file in which to serialize heap")
 #endif
 
 // mksnapshot.cc
 DEFINE_string(extra_code, NULL, "A filename with extra code to be included in"
                                 " the snapshot (mksnapshot only)")
 DEFINE_string(raw_file, NULL, "A file to write the raw snapshot bytes to. "
                               "(mksnapshot only)")
 DEFINE_string(raw_context_file, NULL, "A file to write the raw context "
                                       "snapshot bytes to. (mksnapshot only)")
-DEFINE_bool(omit, false, "Omit raw snapshot bytes in generated code. "
-                         "(mksnapshot only)")
+DEFINE_string(startup_blob, NULL, "Write V8 startup blob file. "
+                                  "(mksnapshot only)")
 
 // code-stubs-hydrogen.cc
 DEFINE_bool(profile_hydrogen_code_stub_compilation, false,
             "Print the time it takes to lazily compile hydrogen code stubs.")
 
 DEFINE_bool(predictable, false, "enable predictable mode")
 DEFINE_neg_implication(predictable, concurrent_recompilation)
 DEFINE_neg_implication(predictable, concurrent_osr)
 DEFINE_neg_implication(predictable, concurrent_sweeping)
 DEFINE_neg_implication(predictable, parallel_sweeping)
@@ skipping 258 matching lines @@
 #undef DEFINE_ALIAS_float
 #undef DEFINE_ALIAS_args
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA