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..2a05ae0616272de1898532f53ae0a3a0843bd262 100755
--- a/tools/gypv8sh.py
+++ b/tools/gypv8sh.py
@@ -36,6 +36,12 @@ 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 os.path.exists(v8nativesfile):

[jochen (gone - plz use gerrit), 2014/10/20 13:55:33]

can you add a commandline flag to this tool, and set it from gyp instead of just
looking whether the files exist?

so we avoid setting the command line flag if there are stale blobs from previous
builds

[baixo1, 2014/10/21 14:00:58]

Done.

+    cmd.extend(['--natives_blob=%s' % v8nativesfile])
+  v8snapshotfile = os.path.join(os.path.dirname(v8_shell), 'snapshot_blob.bin')
+  if 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,