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

third_party/cld_2/cld_2.gyp

Index: third_party/cld_2/cld_2.gyp
diff --git a/third_party/cld_2/cld_2.gyp b/third_party/cld_2/cld_2.gyp
index d0122f18553301dabc9317e30ef69f8084cff77a..9b7fbdfcadca6b5dbc74ef30df9c46e8635f2822 100644
--- a/third_party/cld_2/cld_2.gyp
+++ b/third_party/cld_2/cld_2.gyp
@@ -5,9 +5,9 @@
 # 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.
@@ -27,7 +27,6 @@
         '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',
@@ -77,6 +76,24 @@
         ['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',
+           ],
+        }],
       ],
     },
   ],