Add lexer-shell for running lexer benchmarks.

tools/lexer-shell.gyp

 # Copyright 2013 the V8 project authors. All rights reserved.
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-# Watchlist Rules
-# Refer: http://dev.chromium.org/developers/contributing-code/watchlists
-
-# IMPORTANT: The regular expression filepath is tested against each path using
-# re.search, so it is not usually necessary to add .*.
-
 {
-  'WATCHLIST_DEFINITIONS': {
-    'public_api': {
-      'filepath': 'include/',
+  'variables': {
+    'v8_code': 1,
+    'v8_enable_i18n_support%': 1,
+  },
+  'includes': ['../build/toolchain.gypi', '../build/features.gypi'],
+  'targets': [
+    {
+      'target_name': 'lexer-shell',
+      'type': 'executable',
+      'dependencies': [
+        '../tools/gyp/v8.gyp:v8',
+      ],
+      'conditions': [
+        ['v8_enable_i18n_support==1', {
+          'dependencies': [
+            '<(icu_gyp_path):icui18n',
+            '<(icu_gyp_path):icuuc',
+          ],
+        }],
+      ],
+      'include_dirs+': [
+        '../src',
+      ],
+      'sources': [
+        'lexer-shell.cc',
+      ],
     },
-  },
-
-  'WATCHLISTS': {
-    'public_api': [
-      'phajdan.jr@chromium.org',
-    ],
-  },
+  ],
 }