Add a switch to control which CLD2 tables are used at build time.

third_party/cld_2/cld_2.gyp

 # Copyright 2013 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.
 
 # Note to maintainers: In the January 2014 release (*_0122*), there are some
 # options for building:
 # Pick one quadgram file (cld2_generated_quadchrome*.cc):
-#   0122_16 = 160K entries, smallest size, lowest accuracy
-#   0122_19 = 192K entries, medium size, medium accuracy
-#   0122_2  = 256K entries, largest size, highest accuracy
+#   0122_16 = 160K entries, smallest size, lowest accuracy (set cld2_table_size=0)
+#   0122_19 = 192K entries, medium size, medium accuracy (set cld2_table_size=1)
+#   0122_2  = 256K entries, largest size, highest accuracy (set cld2_table_size=2)
 #
 # For the CJK bigram file (cld_generated_cjk_delta_bi*.cc), always use
 # cld_generated_cjk_delta_bi_4.cc, as this is intended for use with Chromium.
 # The _32 variant of the file is intended for applications that use the full
 # 175-language version of CLD2.
 
 {
   'targets': [
     {
       'target_name': 'cld_2',
       'type': 'static_library',
       'include_dirs': [
         'src/internal',
         'src/public',
       ],
       'sources': [
         'src/internal/cld2_generated_cjk_compatible.cc',
         'src/internal/cld2_generated_deltaoctachrome0122.cc',
         'src/internal/cld2_generated_distinctoctachrome0122.cc',
-        'src/internal/cld2_generated_quadchrome0122_2.cc',
         'src/internal/cld2tablesummary.h',
         'src/internal/cld_generated_cjk_delta_bi_4.cc',
         'src/internal/cld_generated_cjk_uni_prop_80.cc',
         'src/internal/cld_generated_score_quad_octa_0122_2.cc',
         'src/internal/cldutil.cc',
         'src/internal/cldutil.h',
         'src/internal/cldutil_shared.cc',
         'src/internal/cldutil_shared.h',
         'src/internal/compact_lang_det.cc',
         'src/internal/compact_lang_det_hint_code.cc',
@@ skipping 29 matching lines @@
         'src/internal/utf8scannot_lettermarkspecial.h',
         'src/internal/utf8statetable.cc',
         'src/internal/utf8statetable.h',
         'src/public/compact_lang_det.h',
         'src/public/encodings.h',
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_disabled_warnings': [4267],
         }],
+        ['cld2_table_size==0', {
+          # Small table sizes
+          'sources+': [
+            'src/internal/cld2_generated_quadchrome0122_16.cc',
+           ],
+        }],
+        ['cld2_table_size==1', {
+          # Medium table sizes
+          'sources+': [
+            'src/internal/cld2_generated_quadchrome0122_19.cc',
+           ],
+        }],
+        ['cld2_table_size==2', {
+          # Large table sizes
+          'sources+': [
+            'src/internal/cld2_generated_quadchrome0122_2.cc',
+           ],
+        }],
       ],
     },
   ],
 }