[sqlite] sql::Recovery working under USE_SYSTEM_SQLITE.

third_party/sqlite/BUILD.gn

Index: third_party/sqlite/BUILD.gn
diff --git a/third_party/sqlite/BUILD.gn b/third_party/sqlite/BUILD.gn
index 8400837db8c2d34243e75288573eb8b5f5a81ac4..dd6e655c8ac0a943e0a0034d2f7afa46baf44c3a 100644
--- a/third_party/sqlite/BUILD.gn
+++ b/third_party/sqlite/BUILD.gn
@@ -225,12 +225,22 @@ if (use_system_sqlite) {
     public_configs = [ ":sqlite_config" ]
     if (is_ios) {
       deps = [
+        ":sqlite_recover",

[Scott Hess - ex-Googler, 2016/03/10 18:14:50]

This change was obviously suggested from the sqlite.gyp difference, but AFAICT
it didn't actually matter because gn calculated differences correctly. 
Unfortunately trybots and commit-queue don't consider gn on ios, apparently, and
I had only tested gn on Linux where I couldn't get use_system_sqlite to work. 
So...

         ":sqlite_regexp",
       ]
     }
   }
 
   if (is_ios) {
+    source_set("sqlite_recover") {
+      sources = [
+        # TODO(shess): Move out of the SQLite source tree, perhaps to ext/.
+        "src/src/recover.c",
+        "src/src/recover.h",
+        "src/src/recover_varint.c",
+      ]
+    }
+
     source_set("sqlite_regexp") {
       defines = [
         # Necessary to statically compile the extension.