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

build/config/mac/rules.gni

Index: build/config/mac/rules.gni
diff --git a/build/config/mac/rules.gni b/build/config/mac/rules.gni
index f3f43a1d0df69cd10d6f30bf5e7588a0ea8fe30c..39cbd1386aa7fdfa7265e8e9026b1df86bec6774 100644
--- a/build/config/mac/rules.gni
+++ b/build/config/mac/rules.gni
@@ -45,9 +45,16 @@ template("framework_bundle") {
                            "*",
                            [
                              "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) {