Import SQLite 3.10.2.

third_party/sqlite/BUILD.gn

 # Copyright (c) 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.
 
 declare_args() {
   # Controls whether the build should uses the version of sqlite3 library
   # shipped with the system (currently only supported on iOS) or the one
   # shipped with Chromium source.
   use_system_sqlite = is_ios
 }
@@ skipping 62 matching lines @@
       # percentile of Chrome databases in the wild.
       # TODO(shess): A 64-bit-specific value could be 1G or more.
       # TODO(shess): Figure out if exceeding this is costly.
       "SQLITE_MAX_MMAP_SIZE=268435456",
 
       # Use a read-only memory map when mmap'ed I/O is enabled to prevent memory
       # stompers from directly corrupting the database.
       # TODO(shess): Upstream the ability to use this define.
       "SQLITE_MMAP_READ_ONLY=1",
 
+      # By default SQLite pre-allocates 100 pages of pcache data, which will not
+      # be released until the handle is closed.  This is contrary to Chromium's
+      # memory-usage goals.
+      "SQLITE_DEFAULT_PCACHE_INITSZ=0",
+
       # NOTE(shess): Some defines can affect the amalgamation.  Those should be
       # added to google_generate_amalgamation.sh, and the amalgamation
       # re-generated.  Usually this involves disabling features which include
       # keywords or syntax, for instance SQLITE_OMIT_VIRTUALTABLE omits the
       # virtual table syntax entirely.  Missing an item usually results in
       # syntax working but execution failing.  Review:
       #   src/src/parse.py
       #   src/tool/mkkeywordhash.c
     ]
     if (is_component_build) {
@@ skipping 144 matching lines @@
         "//third_party/icu",
       ]
       if (is_clang) {
         # src/ext/icu/icu.c uses assert(!"string") which causes warnings about
         # conversion from string literal to bool.
         configs -= [ "//build/config/clang:extra_warnings" ]
       }
     }
   }
 }