Update bindings gn files for binding modularization.

Source/bindings/core/core.gni

Index: Source/bindings/core/core.gni
diff --git a/Source/bindings/core/core.gni b/Source/bindings/core/core.gni
index 8cfaf086e26d78ac2c7f63521a0256e12a01e7db..b8f49cfd2595b1a8178ec6a26eac0ed4ba7c7417 100644
--- a/Source/bindings/core/core.gni
+++ b/Source/bindings/core/core.gni
@@ -4,5 +4,20 @@
 
 # FIXME: factor out bindings_core http://crbug.com/358074
 import("//third_party/WebKit/Source/bindings/bindings.gni")
+import("//third_party/WebKit/Source/core/core.gni")
 
 bindings_core_output_dir = "$bindings_output_dir/core"
+
+# Global constructors
+core_global_constructors_original_interfaces = [
+  "Window",
+  "SharedWorkerGlobalScope",
+  "DedicatedWorkerGlobalScope",
+]
+
+core_global_constructors_generated_idl_files = []
+foreach (interface, core_global_constructors_original_interfaces) {
+  core_global_constructors_generated_idl_files += [
+    "$blink_core_output_dir/${interface}CoreConstructors.idl"
+  ]
+}