Add more components unittests to the GN build.

components/dom_distiller/content/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.
 
 if (!is_ios) {
   # GYP version: components/dom_distiller.gypi:dom_distiller_content
   static_library("content") {
     sources = [
      "distiller_page_web_contents.cc",
      "distiller_page_web_contents.h",
      "dom_distiller_viewer_source.cc",
      "dom_distiller_viewer_source.h",
      "web_contents_main_frame_observer.cc",
      "web_contents_main_frame_observer.h",
     ]
 
     public_deps = [
       "//components/dom_distiller/core",
     ]
     deps = [
+      "//base",
       "//components/resources",
       "//components/strings",
       "//content/public/browser",
       "//net",
       "//skia",
       "//sync",
+      "//ui/gfx",
+      "//url",
     ]
   }
 }