Add most missing blink files to .gn files

third_party/WebKit/Source/modules/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/split_static_library.gni")
 import("//build/config/chromecast_build.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/v8.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 35 matching lines @@
   output_name = "blink_modules"
 
   if (modules_target_type == "split_static_library") {
     split_count = 5
   }
 
   visibility = []  # Allow re-assignment of list.
   visibility = [ "//third_party/WebKit/*" ]
 
   sources = [
+    "EventModules.h",
+    "EventModulesFactory.h",
+    "EventTargetModules.h",
+    "ModulesExport.h",
     "ModulesInitializer.cpp",
     "ModulesInitializer.h",
   ]
 
   sources += generated_modules_dictionary_files
   sources += generated_modules_callback_function_files
 
   # Compile sources generated by module_names script.
   sources += get_target_outputs(":module_names")
 
@@ skipping 251 matching lines @@
     ":modules_testing",
     "//components/payments/content:payment_request_blink",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/core",
     "//third_party/WebKit/Source/wtf",
     "//v8",
   ]
 }