[iOS/GN] Convert //ios/third_party/ochamcrest to build a framework.

build/config/mac/rules.gni

 # 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.
 
 import("//build/toolchain/toolchain.gni")
 
 # Template to package a shared library into a framework bundle.
 #
 # Arguments
 #
@@ skipping 27 matching lines @@
 
   _shared_library_target = target_name + "_shared_library"
   _shared_library_bundle_data = _shared_library_target + "_bundle_data"
 
   shared_library(_shared_library_target) {
     visibility = [ ":$_shared_library_bundle_data" ]
     forward_variables_from(invoker,
                            "*",
                            [
                              "assert_no_deps",
+                             "configs",
                              "data_deps",
                              "output_name",
                            ])
+    if (defined(invoker.configs)) {

[Dirk Pranke, 2016/04/11 16:38:03]

nit: can you add a comment here referencing the bugs as well to explain this
weirdness?

[Robert Sesek, 2016/04/11 18:32:29]

Also document this up top as an argument?

[sdefresne, 2016/04/12 13:05:19]

Removed the need for the workaround by using set_defaults, so not done.

+      configs += invoker.configs
+    }
+    if (defined(invoker.removed_configs)) {
+      configs -= invoker.removed_configs
+    }
   }
 
   bundle_data(_shared_library_bundle_data) {
     visibility = [ ":$_framework_target" ]
     forward_variables_from(invoker, [ "testonly" ])
     sources = [
       "$root_out_dir/${shlib_prefix}${_shared_library_target}${shlib_extension}",
     ]
     outputs = [
       "{{bundle_executable_dir}}/$_output_name",
@@ skipping 94 matching lines @@
 
   framework_bundle(target_name) {
     forward_variables_from(invoker, "*", [ "info_plist" ])
 
     if (!defined(deps)) {
       deps = []
     }
     deps += [ ":$_info_plist_bundle_data" ]
   }
 }