[serializer] Add API to warm up startup snapshot with an additional script.

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 13 matching lines @@
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
   'variables': {
     'icu_use_data_file_flag%': 0,
     'v8_code': 1,
     'v8_random_seed%': 314159265,
     'v8_vector_stores%': 0,
-    'embed_script%': "",
+    'embed_script%': "-",
+    'warmup_script%': "-",
     'v8_extra_library_files%': [],
     'v8_experimental_extra_library_files%': [],
     'mksnapshot_exec': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)mksnapshot<(EXECUTABLE_SUFFIX)',
   },
   'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
     {
       'target_name': 'v8',
       'dependencies_traverse': 1,
       'dependencies': ['v8_maybe_snapshot'],
@@ skipping 152 matching lines @@
         '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/experimental-extras-libraries.cc',
         '<(INTERMEDIATE_DIR)/snapshot.cc',
       ],
       'actions': [
         {
           'action_name': 'run_mksnapshot',
           'inputs': [
             '<(mksnapshot_exec)',
             '<(embed_script)',
+            '<(warmup_script)',
           ],
           'outputs': [
             '<(INTERMEDIATE_DIR)/snapshot.cc',
           ],
           'variables': {
             'mksnapshot_flags': [
               '--log-snapshot-positions',
               '--logfile', '<(INTERMEDIATE_DIR)/snapshot.log',
             ],
             'conditions': [
               ['v8_random_seed!=0', {
                 'mksnapshot_flags': ['--random-seed', '<(v8_random_seed)'],
               }],
               ['v8_vector_stores!=0', {
                 'mksnapshot_flags': ['--vector-stores'],
               }],
             ],
           },
           'action': [
             '<(mksnapshot_exec)',
             '<@(mksnapshot_flags)',
             '--startup_src', '<@(INTERMEDIATE_DIR)/snapshot.cc',
             '<(embed_script)',
+            '<(warmup_script)',
           ],
         },
       ],
     },
     {
       'target_name': 'v8_nosnapshot',
       'type': 'static_library',
       'dependencies': [
         'v8_base',
       ],
@@ skipping 83 matching lines @@
                   'conditions': [
                     ['want_separate_host_toolset==1', {
                       'target_conditions': [
                         ['_toolset=="host"', {
                           'outputs': ['<(PRODUCT_DIR)/snapshot_blob_ignition_host.bin'],
                           'action': [
                             '<(mksnapshot_exec)',
                             '<@(mksnapshot_flags_ignition)',
                             '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob_ignition_host.bin',
                             '<(embed_script)',
+                            '<(warmup_script)',
                           ],
                         }, {
                           'outputs': ['<(PRODUCT_DIR)/snapshot_blob_ignition.bin'],
                           'action': [
                             '<(mksnapshot_exec)',
                             '<@(mksnapshot_flags_ignition)',
                             '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob_ignition.bin',
                             '<(embed_script)',
+                            '<(warmup_script)',
                           ],
                         }],
                       ],
                     }, {
                       'outputs': ['<(PRODUCT_DIR)/snapshot_blob_ignition.bin'],
                       'action': [
                         '<(mksnapshot_exec)',
                         '<@(mksnapshot_flags_ignition)',
                         '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob_ignition.bin',
                         '<(embed_script)',
+                        '<(warmup_script)',
                       ],
                     }],
                   ],
                 },
               ],
             }],
           ],
           'dependencies': [
             'v8_base',
           ],
@@ skipping 25 matching lines @@
               'conditions': [
                 ['want_separate_host_toolset==1', {
                   'target_conditions': [
                     ['_toolset=="host"', {
                       'outputs': ['<(PRODUCT_DIR)/snapshot_blob_host.bin'],
                       'action': [
                         '<(mksnapshot_exec)',
                         '<@(mksnapshot_flags)',
                         '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob_host.bin',
                         '<(embed_script)',
+                        '<(warmup_script)',
                       ],
                     }, {
                       'outputs': ['<(PRODUCT_DIR)/snapshot_blob.bin'],
                       'action': [
                         '<(mksnapshot_exec)',
                         '<@(mksnapshot_flags)',
                         '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob.bin',
                         '<(embed_script)',
+                        '<(warmup_script)',
                       ],
                     }],
                   ],
                 }, {
                   'outputs': ['<(PRODUCT_DIR)/snapshot_blob.bin'],
                   'action': [
                     '<(mksnapshot_exec)',
                     '<@(mksnapshot_flags)',
                     '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob.bin',
                     '<(embed_script)',
+                    '<(warmup_script)',
                   ],
                 }],
               ],
             },
           ],
         }],
       ],
     },
     {
       'target_name': 'v8_base',
@@ skipping 1844 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }