Add components and CLD to GN build.

components/web_modal.gypi

Index: components/web_modal.gypi
diff --git a/components/web_modal.gypi b/components/web_modal.gypi
index 356cb7eb6823064811d1e4f1369df292e80b41e7..25028034dea7db3118512477abf26c8aac5b5941 100644
--- a/components/web_modal.gypi
+++ b/components/web_modal.gypi
@@ -5,6 +5,7 @@
 {
   'targets': [
     {
+      # GN version: //components/web_modal
       'target_name': 'web_modal',
       'type': 'static_library',
       'include_dirs': [
@@ -15,10 +16,8 @@
         '../content/content.gyp:content_browser',
         '../skia/skia.gyp:skia',
       ],
-      'defines': [
-        'WEB_MODAL_IMPLEMENTATION',
-      ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'web_modal/modal_dialog_host.cc',
         'web_modal/modal_dialog_host.h',
         'web_modal/native_web_contents_modal_dialog.h',
@@ -32,12 +31,14 @@
       ],
     },
     {
+      # GN version: //components/web_modal:test_support
       'target_name': 'web_modal_test_support',
       'type': 'static_library',
       'dependencies': [
         'web_modal',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'web_modal/test_web_contents_modal_dialog_host.cc',
         'web_modal/test_web_contents_modal_dialog_host.h',
         'web_modal/test_web_contents_modal_dialog_manager_delegate.cc',