Turn //mojo/public/cpp/bindings and //mojo/public/cpp/system into components

mojo/public/cpp/bindings/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.
 
-static_library("bindings") {
+component("bindings") {
   sources = [
     "array.h",
     "array_data_view.h",
     "array_traits.h",
     "array_traits_carray.h",
     "array_traits_standard.h",
     "array_traits_stl.h",
     "associated_binding.h",
     "associated_binding_set.h",
     "associated_group.h",
     "associated_group_controller.h",
     "associated_interface_ptr.h",
     "associated_interface_ptr_info.h",
     "associated_interface_request.h",
     "binding.h",
     "binding_set.h",
+    "bindings_export.h",
     "connection_error_callback.h",
     "connector.h",
     "enum_traits.h",
     "filter_chain.h",
     "interface_data_view.h",
     "interface_endpoint_client.h",
     "interface_endpoint_controller.h",
     "interface_id.h",
     "interface_ptr.h",
     "interface_ptr_info.h",
@@ skipping 101 matching lines @@
     ":struct_traits",
     "//base",
     "//ipc:param_traits",
     "//mojo/public/cpp/system",
   ]
 
   deps = [
     "//base",
     "//mojo/public/interfaces/bindings:bindings_cpp_sources",
   ]
+
+  defines = [ "MOJO_CPP_BINDINGS_IMPLEMENTATION" ]

[dcheng, 2016/09/21 23:21:03]

Originally, I only componentized bindings, but it depends on
//mojo/public/cpp/system, which is a source_set.

I made system a component as well, but since we already have a
MOJO_SYSTEM_EXPORT macro (for //mojo/public/c/system), I used
MOJO_CPP_SYSTEM_IMPLEMENTATION (and thus MOJO_CPP_BINDINGS_IMPLEMENTATION here
for consistency)

 }
 
 source_set("struct_traits") {
   sources = [
     "struct_traits.h",
   ]
 }
 
 if (!is_ios) {
   # TODO(yzshen): crbug.com/617718 Consider moving this into blink.
@@ skipping 12 matching lines @@
     ]
 
     public_deps = [
       ":bindings",
       "//third_party/WebKit/Source/wtf",
     ]
 
     public_configs = [ "//third_party/WebKit/Source:config" ]
   }
 }