[Ignition] Use separate startup data for ignition.

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 265 matching lines @@
                 'V8_SHARED',
                 'BUILDING_V8_SHARED',
               ],
               'direct_dependent_settings': {
                 'defines': [
                   'V8_SHARED',
                   'USING_V8_SHARED',
                 ],
               },
             }],
+            # Extra snapshot blob for ignition. Separate host toolset is not
+            # supported.

[rmcilroy, 2016/02/04 09:53:47]

Do we have Android perf bots we could run the tests on? If so, could we make
this a TODO since it would be good to get numbers on Android too eventually.

+            ['v8_separate_ignition_snapshot==1', {
+              # This is concatenated to the other actions list of
+              # v8_external_snapshot.
+              'actions': [
+                {
+                  'action_name': 'run_mksnapshot (ignition)',
+                  'inputs': [
+                    '<(mksnapshot_exec)',
+                  ],
+                  'variables': {
+                    # TODO: Extract common mksnapshot_flags to a separate
+                    # variable.
+                    'mksnapshot_flags_ignition': [
+                      '--ignition',
+                      '--log-snapshot-positions',
+                      '--logfile', '<(INTERMEDIATE_DIR)/snapshot_ignition.log',
+                    ],
+                    'conditions': [
+                      ['v8_random_seed!=0', {
+                        'mksnapshot_flags_ignition': ['--random-seed', '<(v8_random_seed)'],

[Yang, 2016/02/04 10:11:36]

do we still care about 80-char limit here and below?

[Michael Achenbach, 2016/02/04 10:16:00]

In gyp files not really. There are lots of other violations all over the
place...

+                      }],
+                      ['v8_vector_stores!=0', {
+                        'mksnapshot_flags_ignition': ['--vector-stores'],
+                      }],
+                    ],
+                  },
+                  'outputs': [
+                    '<(PRODUCT_DIR)/snapshot_blob_ignition.bin',
+                  ],
+                  'action': [
+                    '<(mksnapshot_exec)',
+                    '<@(mksnapshot_flags_ignition)',
+                    '--startup_blob', '<(PRODUCT_DIR)/snapshot_blob_ignition.bin',
+                    '<(embed_script)',
+                  ],
+                },
+              ],
+            }],
           ],
           'dependencies': [
             'v8_base',
           ],
           'include_dirs+': [
             '../..',
           ],
           'sources': [
             '../../src/snapshot/natives-external.cc',
             '../../src/snapshot/snapshot-external.cc',
@@ skipping 1839 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }