Work on Windows GN component build.

gpu/command_buffer/common/BUILD.gn

 # Copyright (c) 2013 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.
 
-source_set("common") {
+# The files here go into the "gpu" component in a component build (with
+# "command_buffer_common" just forwarding) and goes into a static library in
+# non-component build. This needs to match the GYP build which was likely an
+# attempt to make larger components to help with loading.
+group("common") {
+  if (is_component_build) {
+    public_deps = [
+      "//gpu",
+    ]
+  } else {
+    public_deps = [
+      ":common_sources",
+    ]
+  }
+}
+
+source_set("common_sources") {
+  visibility = [ "//gpu/*" ]
+
   sources = [
     "bitfield_helpers.h",
     "buffer.cc",
     "buffer.h",
     "capabilities.cc",
     "capabilities.h",
     "cmd_buffer_common.cc",
     "cmd_buffer_common.h",
     "command_buffer.h",
     "constants.h",
@@ skipping 32 matching lines @@
   ]
 
   defines = [ "GLES2_UTILS_IMPLEMENTATION" ]
 
   deps = [
     "//base",
   ]
 
   all_dependent_configs = [ "//third_party/khronos:khronos_headers" ]
 }