Add BUILD.gn rules to compile third_party/class-dump.

testing/iossim/iossim.gyp

Index: testing/iossim/iossim.gyp
diff --git a/testing/iossim/iossim.gyp b/testing/iossim/iossim.gyp
index 2a8c2ae7383b5f1022e31e959375fddcffadd39a..d6bb4eac9b526e25227f3b6513f4447de0781b88 100644
--- a/testing/iossim/iossim.gyp
+++ b/testing/iossim/iossim.gyp
@@ -6,6 +6,8 @@
   'variables': {
     'mac_deployment_target': '10.9',
     'mac_sdk_min': '10.9',
+    'class_dump_bin': '<(PRODUCT_DIR)/class-dump',
+    'class_dump_py': '<(DEPTH)/third_party/class-dump/class-dump.py',
   },
   'conditions': [
     ['OS!="ios" or "<(GENERATOR)"!="xcode" or "<(GENERATOR_FLAVOR)"=="ninja"', {
@@ -33,65 +35,66 @@
           ],
           'actions': [
             {
-              'action_name': 'generate_dvt_foundation_header',
+              'action_name': 'generate_dvt_core_simulator',
               'inputs': [
-                '<(iphone_sim_path)/DVTFoundation.framework/Versions/Current/DVTFoundation',
-                '<(PRODUCT_DIR)/class-dump',
+                '<(class_dump_bin)',
+                '<(class_dump_py)',
+                '<(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework/Versions/Current/CoreSimulator',
               ],
               'outputs': [
-                '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h'
+                '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h'
               ],
               'action': [
-                # Actions don't provide a way to redirect stdout, so a custom
-                # script is invoked that will execute the first argument and
-                # write the output to the file specified as the second argument.
-                # -I sorts classes, categories, and protocols by inheritance.
-                # -C <regex> only displays classes matching regular expression.
-                './redirect-stdout.sh',
-                '<(PRODUCT_DIR)/class-dump -CDVTStackBacktrace|DVTInvalidation|DVTMixIn <(iphone_sim_path)/DVTFoundation.framework',
-                '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h',
+                'python',
+                '<(class_dump_py)',
+                '-t', '<(class_dump_bin)',
+                '-o', '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h',
+                '--',
+                '-CSim',
+                '<(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework',
               ],
-              'message': 'Generating DVTFoundation.h',
+              'message': 'Generating CoreSimulator.h',
             },
             {
-              'action_name': 'generate_dvt_core_simulator',
+              'action_name': 'generate_dvt_foundation_header',
               'inputs': [
-                '<(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework/Versions/Current/CoreSimulator',
-                '<(PRODUCT_DIR)/class-dump',
+                '<(class_dump_bin)',
+                '<(class_dump_py)',
+                '<(iphone_sim_path)/DVTFoundation.framework/Versions/Current/DVTFoundation',
               ],
               'outputs': [
-                '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h'
+                '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h'
               ],
               'action': [
-                # Actions don't provide a way to redirect stdout, so a custom
-                # script is invoked that will execute the first argument and
-                # write the output to the file specified as the second argument.
-                # -I sorts classes, categories, and protocols by inheritance.
-                # -C <regex> only displays classes matching regular expression.
-                './redirect-stdout.sh',
-                '<(PRODUCT_DIR)/class-dump -CSim <(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework',
-                '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h',
+                'python',
+                '<(class_dump_py)',
+                '-t', '<(class_dump_bin)',
+                '-o', '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h',
+                '--',
+                '-CDVTStackBacktrace|DVTInvalidation|DVTMixIn',
+                '<(iphone_sim_path)/DVTFoundation.framework',
               ],
-              'message': 'Generating CoreSimulator.h',
+              'message': 'Generating DVTFoundation.h',
             },
             {
               'action_name': 'generate_dvt_iphone_sim_header',
               'inputs': [
+                '<(class_dump_bin)',
+                '<(class_dump_py)',
                 '<(iphone_sim_path)/DVTiPhoneSimulatorRemoteClient.framework/Versions/Current/DVTiPhoneSimulatorRemoteClient',
-                '<(PRODUCT_DIR)/class-dump',
               ],
               'outputs': [
                 '<(INTERMEDIATE_DIR)/iossim/DVTiPhoneSimulatorRemoteClient.h'
               ],
               'action': [
-                # Actions don't provide a way to redirect stdout, so a custom
-                # script is invoked that will execute the first argument and
-                # write the output to the file specified as the second argument.
-                # -I sorts classes, categories, and protocols by inheritance.
-                # -C <regex> only displays classes matching regular expression.
-                './redirect-stdout.sh',
-                '<(PRODUCT_DIR)/class-dump -I -CiPhoneSimulator <(iphone_sim_path)/DVTiPhoneSimulatorRemoteClient.framework',
-                '<(INTERMEDIATE_DIR)/iossim/DVTiPhoneSimulatorRemoteClient.h',
+                'python',
+                '<(class_dump_py)',
+                '-t', '<(class_dump_bin)',
+                '-o', '<(INTERMEDIATE_DIR)/iossim/DVTiPhoneSimulatorRemoteClient.h',
+                '--',
+                '-I',
+                '-CiPhoneSimulator',
+                '<(iphone_sim_path)/DVTiPhoneSimulatorRemoteClient.framework',
               ],
               'message': 'Generating DVTiPhoneSimulatorRemoteClient.h',
             },