Add lexer-shell for running lexer benchmarks.

tools/lexer-shell.gyp

Index: tools/lexer-shell.gyp
diff --git a/WATCHLISTS b/tools/lexer-shell.gyp
similarity index 72%
copy from WATCHLISTS
copy to tools/lexer-shell.gyp
index 9c2bce9c5589c22649b4a2c94837f00c8d669be1..8e6ab7a844becd99881d09f3e813a471dd4b14b3 100644
--- a/WATCHLISTS
+++ b/tools/lexer-shell.gyp
@@ -25,22 +25,33 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-# 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/',
-    },
-  },
-
-  'WATCHLISTS': {
-    'public_api': [
-      'phajdan.jr@chromium.org',
-    ],
+  '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',
+      ],
+    },
+  ],
 }