Infrastructure for reading V8's initial snapshot from external files

tools/gypv8sh.py

Index: tools/gypv8sh.py
diff --git a/tools/gypv8sh.py b/tools/gypv8sh.py
index 3f81a8bc94c280e2eae9c835d0a25cdd17002ba1..9724ed4b1a6ed12b2b68a91748e049f231ba0e6f 100755
--- a/tools/gypv8sh.py
+++ b/tools/gypv8sh.py
@@ -26,6 +26,8 @@ def main ():
   parser.add_option('--deps_js', action="store",
                     help=("Path to deps.js for dependency resolution, " +
                           "optional."))
+  parser.add_option('--external', action='store',
+                    help="Load V8's initial snapshot from external files (y/n)")
   (opts, args) = parser.parse_args()
 
   if len(args) != 9:
@@ -36,6 +38,12 @@ def main ():
   icudatafile = os.path.join(os.path.dirname(v8_shell), 'icudtl.dat')
   if os.path.exists(icudatafile):
     cmd.extend(['--icu-data-file=%s' % icudatafile])
+  v8nativesfile = os.path.join(os.path.dirname(v8_shell), 'natives_blob.bin')
+  if opts.external == 'y' and os.path.exists(v8nativesfile):
+    cmd.extend(['--natives_blob=%s' % v8nativesfile])
+  v8snapshotfile = os.path.join(os.path.dirname(v8_shell), 'snapshot_blob.bin')
+  if opts.external == 'y' and os.path.exists(v8snapshotfile):
+    cmd.extend(['--snapshot_blob=%s' % v8snapshotfile])
   arguments = [js2webui, inputfile, inputrelfile, opts.deps_js,
                cxxoutfile, test_type]
   cmd.extend(['-e', "arguments=" + json.dumps(arguments), mock_js,