[gin] Fingerprint the V8 snapshot files on Windows and verify before loading the snapshot.

gin/fingerprint/fingerprint_v8_snapshot.gypi

Index: gin/fingerprint/fingerprint_v8_snapshot.gypi
diff --git a/gin/fingerprint/fingerprint_v8_snapshot.gypi b/gin/fingerprint/fingerprint_v8_snapshot.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..ede0de3ea5c1e1b33f492c31a8efc7c0bd9002af
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+++ b/gin/fingerprint/fingerprint_v8_snapshot.gypi
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+# Copyright 2015 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.
+
+# This file is meant to be included into a target to provide a rule that
+# fingerprints the v8 snapshot and generates a .cc file which includes this
+# fingerprint.
+#
+# To use this, create a gyp target with the following form:
+#  {
+#    'target_name': 'gin_v8_snapshot_fingerprint',
+#    'type': 'none',
+#    'variables': {
+#      'snapshot_file': 'snapshot blob file to be fingerprinted',
+#      'natives_file': 'natives blob file to be fingerprinted',
+#      'output_file': 'output .cc file to generate with fingerprints',
+#    },
+#    'includes': [ '../gin/fingerprint/fingerprint_v8_snapshot.gypi' ],
+#  },
+#
+
+{
+  'conditions': [
+    ['v8_use_external_startup_data==1', {
+      'actions': [
+        {
+          'action_name': 'Generate V8 snapshot fingerprint',
+          'message': 'Generating V8 snapshot fingerprint',
+          'inputs': [
+            '<(DEPTH)/gin/fingerprint/fingerprint_v8_snapshot.py',
+            '<(snapshot_file)',
+            '<(natives_file)',
+          ],
+          'outputs': [
+            '<(output_file)',
+          ],
+          'action': [
+            'python', '<(DEPTH)/gin/fingerprint/fingerprint_v8_snapshot.py',
+            '--snapshot_file=<(snapshot_file)',
+            '--natives_file=<(natives_file)',
+            '--output_file=<(output_file)',
+          ],
+        }
+      ],
+    }],
+  ],
+}