Fix IDL dependency computation for partial interfaces

Source/bindings/derived_sources.gyp

Index: Source/bindings/derived_sources.gyp
diff --git a/Source/bindings/derived_sources.gyp b/Source/bindings/derived_sources.gyp
index 9677e33d56bd508843b42d93cd6bc810c5ee0a11..b43829ca6ecf3abf1096e869de19b004f8024929 100644
--- a/Source/bindings/derived_sources.gyp
+++ b/Source/bindings/derived_sources.gyp
@@ -45,8 +45,7 @@
     'support_idl_files': [
       '<@(webcore_testing_support_idl_files)',
     ],
-    'testing_support_idl_files': [
-      '<@(webcore_testing_support_idl_files)',
+    'generated_support_idl_files': [
       '<@(generated_webcore_testing_support_idl_files)',
     ],
     'compiler_module_files': [
@@ -202,7 +201,8 @@
       ],
       'sources': [
         '<@(main_idl_files)',
-        '<@(testing_support_idl_files)',
+        '<@(support_idl_files)',
+        '<@(generated_support_idl_files)',
       ],
       'rules': [{
         'rule_name': 'binding',
@@ -224,7 +224,7 @@
           #
           # If a new partial interface is added, need to regyp to update these
           # dependencies, as these are computed statically at gyp runtime.
-          '<!@pymod_do_main(list_idl_files_with_partial_interface <@(main_idl_files))',
+          '<!@pymod_do_main(list_idl_files_with_partial_interface <@(main_idl_files) <@(support_idl_files))',
           # Generated IDLs are all partial interfaces, hence everything
           # potentially depends on them.
           '<@(generated_global_constructors_idl_files)',
@@ -264,7 +264,14 @@
           '--interfaceDependenciesFile',
           '<(SHARED_INTERMEDIATE_DIR)/blink/InterfaceDependencies.txt',
           '--additionalIdlFiles',
-          '<(testing_support_idl_files)',
+          # Generated IDL files aren't listed in InterfaceDependencies.txt,
+          # b/c they aren't available at GYP run time, so we need to sort them
+          # manually, depending on whether they are (main) interface files,
+          # for which we generate bindings, or dependencies, for which we don't.
+          # generated_support_idl_files are main interfaces, so generate
+          # bindings, but generated_global_constructors_idl_files are all
+          # partial interfaces, so don't (b/c generated by dependents).
+          '<(generated_support_idl_files)',
           '<@(preprocessor)',
           '<@(write_file_only_if_changed)',
           '<(RULE_INPUT_PATH)',