Add more components to "gn check", work on dom_distiller.

components/dom_distiller/content/browser/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.
+
+assert(!is_ios)
+
+# GYP version: components/dom_distiller.gypi:dom_distiller_content_browser
+static_library("browser") {
+  sources = [
+    "distillability_driver.cc",
+    "distillability_driver.h",
+    "distillable_page_utils.cc",
+    "distillable_page_utils.h",
+    "distiller_javascript_service_impl.cc",
+    "distiller_javascript_service_impl.h",
+    "distiller_javascript_utils.cc",
+    "distiller_javascript_utils.h",
+    "distiller_page_web_contents.cc",
+    "distiller_page_web_contents.h",
+    "distiller_ui_handle.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",
+    "//content/public/browser",
+  ]
+  deps = [
+    "//base",
+    "//components/dom_distiller/content/common",
+    "//components/dom_distiller/content/common:mojo_bindings",
+    "//components/resources",
+    "//components/strings",
+    "//content/public/browser",
+    "//content/public/common",
+    "//mojo/environment:chromium",
+    "//mojo/public/cpp/bindings",
+    "//net",
+    "//skia",
+    "//sync",
+    "//third_party/WebKit/public:blink_headers",
+    "//ui/base",
+    "//ui/gfx",
+    "//url",
+  ]
+
+  if (is_android) {
+    sources += [
+      "//components/dom_distiller/android/component_jni_registrar.cc",
+      "//components/dom_distiller/android/component_jni_registrar.h",
+      "distillable_page_utils_android.cc",
+      "distillable_page_utils_android.h",
+    ]
+    deps += [ "//components/dom_distiller/android:jni_headers" ]
+  }
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "dom_distiller_viewer_source_unittest.cc",
+    "web_contents_main_frame_observer_unittest.cc",
+  ]
+  deps = [
+    ":browser",
+    "//content/test:test_support",
+    "//testing/gtest",
+  ]
+}