Make V8 extras a separate type of native

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index fe2ba188d6774fc44ffd3d1acc2eb06144db7810..11e1e44d936421640664e314a35e820c43c7582c 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -180,6 +180,7 @@
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
+        '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
         '<(INTERMEDIATE_DIR)/snapshot.cc',
       ],
       'actions': [
@@ -224,6 +225,7 @@
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
+        '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
         '../../src/snapshot/snapshot-empty.cc',
       ],
       'conditions': [
@@ -1639,6 +1641,7 @@
               '../../tools/concatenate-files.py',
               '<(SHARED_INTERMEDIATE_DIR)/libraries.bin',
               '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental.bin',
+              '<(SHARED_INTERMEDIATE_DIR)/libraries-extras.bin',
             ],
             'conditions': [
               ['want_separate_host_toolset==1', {
@@ -1745,6 +1748,7 @@
         ],
         'libraries_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries.bin',
         'libraries_experimental_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental.bin',
+        'libraries_extras_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-extras.bin',
       },
       'actions': [
         {
@@ -1752,8 +1756,7 @@
           'inputs': [
             '../../tools/js2c.py',
             '<@(library_files)',
-            '<@(i18n_library_files)',
-            '<@(v8_extra_library_files)',
+            '<@(i18n_library_files)'
           ],
           'outputs': [
             '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
@@ -1764,9 +1767,7 @@
             '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
             'CORE',
             '<@(library_files)',
-            '<@(i18n_library_files)',
-            '--extra',
-            '<@(v8_extra_library_files)',
+            '<@(i18n_library_files)'
           ],
           'conditions': [
             [ 'v8_use_external_startup_data==1', {
@@ -1802,6 +1803,31 @@
             }],
           ],
         },
+        {
+          'action_name': 'js2c_extras',
+          'inputs': [
+            '../../tools/js2c.py',
+            '<@(v8_extra_library_files)',
+          ],
+          'outputs': [
+            '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
+          ],
+          'action': [
+            'python',
+            '../../tools/js2c.py',
+            '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
+            'EXTRAS',
+            '<@(v8_extra_library_files)',
+          ],
+          'conditions': [
+            [ 'v8_use_external_startup_data==1', {
+              'outputs': ['<@(libraries_extras_bin_file)'],
+              'action': [
+                '--startup_blob', '<@(libraries_extras_bin_file)',
+              ],
+            }],
+          ],
+        },
       ],
     },
     {