Add the NotificationDatabaseData structure and protobuf

content/browser/BUILD.gn

 # Copyright 2014 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("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/browser/browser.gni")
 import("//media/media_options.gni")
 
 source_set("browser") {
   # Only the public target should depend on this. All other targets (even
   # internal content ones) should depend on the public one.
   visibility = [ "//content/public/browser:browser_sources" ]
 
   defines = []
   libs = []
   ldflags = []
 
   # Shared deps. See also non-iOS deps below.
   deps = [
     "//base",
     "//base:base_static",
     "//content:resources",
+    "//content/browser/notifications:notification_proto",
     "//content/browser/service_worker:service_worker_proto",
     "//content/browser/speech/proto",
     "//content/public/common:common_sources",
     "//crypto",
     "//device/battery",
     "//device/vibration",
     "//google_apis",
     "//net",
     "//skia",
     "//sql",
@@ skipping 405 matching lines @@
   }
 
   if (is_linux && use_openssl) {
     deps += [ "//third_party/boringssl" ]
   }
 
   if (enable_media_mojo_renderer) {
     deps += [ "//media/mojo/services:renderer_service" ]
   }
 }