mandoline filesystem: add a sqlite3 vfs to proxy filesystem usage.

sql/mojo/BUILD.gn

Index: sql/mojo/BUILD.gn
diff --git a/sql/mojo/BUILD.gn b/sql/mojo/BUILD.gn
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+++ b/sql/mojo/BUILD.gn
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+# Copyright 2015 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.
+
+import("//third_party/mojo/src/mojo/public/mojo_application.gni")
+
+source_set("mojo") {
+  sources = [
+    "enable_mojo_fs.cc",
+    "enable_mojo_fs.h",
+  ]
+
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
+  defines = [ "SQL_IMPLEMENTATION" ]
+
+  deps = [
+    "//base",
+    "//base/third_party/dynamic_annotations",
+    "//components/filesystem/public/interfaces",
+    "//mojo/application/public/cpp",
+    "//mojo/common",
+    "//mojo/platform_handle",
+    "//third_party/sqlite",
+  ]
+}
+
+mojo_native_application("apptests") {
+  output_name = "sql_apptests"
+
+  testonly = true
+
+  # Instead of using the code in //sql/test/sql_test_base.h, we should use the
+  # mojo test base class.
+  defines = [ "MOJO_APPTEST_IMPL" ]
+
+  sources = [
+    "../connection_unittest.cc",
+    "../test/paths.cc",
+    "../test/paths.h",
+    "sql_test_base.cc",
+    "sql_test_base.h",
+  ]
+
+  deps = [
+    ":mojo",
+    "//base",
+    "//base/test:test_support",
+    "//components/filesystem/public/interfaces",
+    "//mojo/application/public/cpp:sources",
+    "//mojo/application/public/cpp:test_support",
+    "//sql",
+    "//sql:redirection_header",
+    "//sql:test_support",
+    "//testing/gtest:gtest",
+    "//third_party/mojo/src/mojo/public/cpp/bindings",
+  ]
+}