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 c75388395ac4960fe093b716bb028024d48bfc0f..96de1433d5b0ec155293ea71b85839198161d205 100644
--- a/Source/core/core.gni
+++ b/Source/core/core.gni
@@ -18,6 +18,9 @@ _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 =
@@ -30,9 +33,12 @@ webcore_files = get_path_info(_gypi.webcore_files, "abspath")
 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")
+webcore_testing_idl_files =
+  get_path_info(_gypi.webcore_testing_idl_files, "abspath")
 webcore_testing_dependency_idl_files =
   get_path_info(_gypi.webcore_testing_dependency_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")