Make FTS2 inclusion in SQLite optional

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 7701e2dc4cfd4ce6627206384931d4599bc0843f..163abae0a9f725f9966b48813dd2b053292d6a5b 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -796,6 +796,7 @@
           'enable_managed_users%': 0,
           'enable_task_manager%': 0,
           'use_system_libcxx%': 1,
+          'support_pre_M6_history_database%': 0,
         }],
 
         # Use GPU accelerated cross process image transport by default
@@ -1037,6 +1038,9 @@
       'google_default_client_secret%': '',
       # Native Client is enabled by default.
       'disable_nacl%': '0',
+
+      # Set to 1 to support old history files
+      'support_pre_M6_history_database%': '1',
     },
 
     # Copy conditionally-set variables out one scope.
@@ -1177,6 +1181,7 @@
     'gomadir%': '<(gomadir)',
     'video_hole%': '<(video_hole)',
     'enable_load_completion_hacks%': '<(enable_load_completion_hacks)',
+    'support_pre_M6_history_database%': '<(support_pre_M6_history_database)',
 
     # Whether or not we are building the Athena shell.
     'use_athena%': '0',
@@ -2305,6 +2310,9 @@
       }],
     ],
 
+    # older history files use fts2 instead of fts3
+    'sqlite_enable_fts2%': '<(support_pre_M6_history_database)',
+
     # The path to the ANGLE library.
     'angle_path': '<(DEPTH)/third_party/angle',