IDL: Add build target for IDL dictionary impl generation in core

Source/core/core.gni

Index: Source/core/core.gni
diff --git a/Source/core/core.gni b/Source/core/core.gni
index d21d8e0d17c564144ad6c40a4c5b42dcf5a447ac..d64fe7563cb614983d76407b535fc6355e8ae2c1 100644
--- a/Source/core/core.gni
+++ b/Source/core/core.gni
@@ -18,6 +18,8 @@ _gypi = exec_script(
 # Files for which bindings (.cpp and .h files) will be generated.
 core_idl_files = get_path_info(_gypi.core_idl_files, "abspath")
 
+core_testing_dictionary_idl_files = get_path_info(_gypi.core_testing_dictionary_idl_files, "abspath")
+
 # 'partial interface', target (right side of) 'implements', and
 # interfaces with static bindings (in bindings/core/v8/)
 core_dependency_idl_files =
@@ -31,7 +33,10 @@ webcore_dom_files = get_path_info(_gypi.webcore_dom_files, "abspath")
 webcore_html_files = get_path_info(_gypi.webcore_html_files, "abspath")
 webcore_svg_files = get_path_info(_gypi.webcore_svg_files, "abspath")
 webcore_testing_idl_files = get_path_info(_gypi.webcore_testing_idl_files, "abspath")
+generated_core_testing_dictionary_files =
+  get_path_info(_gypi.generated_core_testing_dictionary_files, "abspath")
 generated_webcore_testing_idl_files =
   get_path_info(_gypi.generated_webcore_testing_idl_files, "abspath")
-webcore_testing_files = get_path_info(_gypi.webcore_testing_files, "abspath")
+webcore_testing_files = get_path_info(_gypi.webcore_testing_files, "abspath") +
+  generated_core_testing_dictionary_files
 core_unittest_files = get_path_info(_gypi.core_unittest_files, "abspath")