V4LDM: Add check for HashPrefix match and some tests

components/safe_browsing_db/BUILD.gn

 # 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/protobuf/proto_library.gni")
 
 proto_library("safebrowsing_proto") {
   sources = [
     "safebrowsing.proto",
   ]
@@ skipping 266 matching lines @@
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "database_manager_unittest.cc",
     "prefix_set_unittest.cc",
     "util_unittest.cc",
     "v4_database_unittest.cc",
     "v4_get_hash_protocol_manager_unittest.cc",
+    "v4_local_database_manager_unittest.cc",
     "v4_protocol_manager_util_unittest.cc",
     "v4_rice_unittest.cc",
     "v4_store_unittest.cc",
     "v4_update_protocol_manager_unittest.cc",
   ]
   deps = [
     ":database_manager",
     ":prefix_set",
     ":safebrowsing_proto",
     ":test_database_manager",
@@ skipping 35 matching lines @@
     "//base",
     "//components/variations",
     "//testing/gtest",
     "//url",
   ]
   if (is_win) {
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     cflags = [ "/wd4267" ]  # Conversion from size_t to 'type'.
   }
 }