Invoke generated lexer along with baseline lexer to compare results.

src/lexer/lexer.gyp

Index: src/lexer/lexer.gyp
diff --git a/src/lexer/lexer.gyp b/src/lexer/lexer.gyp
index 7ebf3d8eb6ea14f1a76c196a5351d77fb0b8881e..67bf40a1b61d9e8454018ffa1052c5a904e6f43b 100644
--- a/src/lexer/lexer.gyp
+++ b/src/lexer/lexer.gyp
@@ -41,10 +41,12 @@
       # Generated source files need this explicitly:
       'include_dirs+': [
         '../../src',
+        '../../src/lexer',
       ],
       'sources': [
         'lexer-shell.cc',
-# TODO: fix compiler errors and add '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
+        'lexer.h',
+        '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
       ],
       'conditions': [
         ['v8_enable_i18n_support==1', {