Import SQLite 3.10.2.

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 395bfa5750f68f323ef952d7792cb591e68c7e22..3030ddb26d5888c343bd2f4a842cc78cf88a8bf3 100644
--- a/third_party/sqlite/BUILD.gn
+++ b/third_party/sqlite/BUILD.gn
@@ -80,6 +80,11 @@ if (!use_system_sqlite) {
       # 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