Work on blink GN bindings

Source/bindings/core/idl.gni

+# 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.
+
+import("//third_party/WebKit/Source/bindings/idl.gni")
+import("//third_party/WebKit/Source/core/core.gni")
+
+# Don't actually read idl.gypi since that just defines variables in terms of
+# others, which gypi_to_gn doesn't handle.
+
+# IDL file lists; see: http://www.chromium.org/developers/web-idl-interfaces
+# Interface IDL files: generate individual bindings (includes testing)
+core_interface_idl_files =
+  core_idl_files +
+  webcore_testing_idl_files +
+  generated_webcore_testing_idl_files
+
+# Static IDL files
+core_static_interface_idl_files =
+  core_idl_files +
+  webcore_testing_idl_files
+core_static_dependency_idl_files =
+  core_dependency_idl_files
+
+# Generated IDL files
+core_generated_interface_idl_files =
+  generated_webcore_testing_idl_files  # interfaces
+core_generated_dependency_idl_files =
+  # FIXME: Generate separate core_global_constructors_idls
+  # http://crbug.com/358074
+  generated_global_constructors_idl_files  # partial interfaces
+
+# Static IDL files / Generated IDL files
+#
+# In GYP, paths need to be passed separately for static and generated files, as
+# static files are listed in a temporary file (b/c too long for command line),
+# but generated files must be passed at the command line, as their paths are
+# not fixed at GYP time, when the temporary file is generated, because their
+# paths depend on the build directory, which varies.
+#
+# FIXME: GN does not have this restriction and we can combine them. While GYP
+# is still supported, we match its behavior for easier maintenance but this can
+# be simplified.
+core_static_idl_files =
+  core_static_interface_idl_files +
+  core_static_dependency_idl_files
+core_generated_idl_files =
+  core_generated_interface_idl_files +
+  core_generated_dependency_idl_files
+
+# Dependency IDL files: don't generate individual bindings, but do process
+# in IDL dependency computation, and count as build dependencies
+# 'core_dependency_idl_files' is already used in Source/core, so avoid
+# collision
+core_all_dependency_idl_files =
+  core_static_dependency_idl_files +
+  core_generated_dependency_idl_files