content: add header files of public that were not listed in the BUILD.gn file

content/public/renderer/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/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 
 # See //content/BUILD.gn for how this works.
 group("renderer") {
@@ skipping 41 matching lines @@
     "render_frame_visitor.h",
     "render_thread.cc",
     "render_thread.h",
     "render_thread_observer.cc",
     "render_thread_observer.h",
     "render_view.h",
     "render_view_observer.cc",
     "render_view_observer.h",
     "render_view_observer_tracker.h",
     "render_view_visitor.h",
+    "renderer_gamepad_provider.h",
     "renderer_ppapi_host.h",
     "resource_fetcher.h",
     "seccomp_sandbox_status_android.h",
     "video_encode_accelerator.cc",
     "video_encode_accelerator.h",
     "window_features_converter.cc",
     "window_features_converter.h",
   ]
 
   configs += [ "//content:content_implementation" ]
@@ skipping 45 matching lines @@
     deps += [
       "//content/public/common:feature_h264_with_openh264_ffmpeg",
       "//content/public/common:features",
     ]
   }
 
   if (enable_plugins) {
     sources += [ "plugin_instance_throttler.h" ]
   }
 }