[Ignition] Use separate startup data for ignition.

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index c418aa737a878e0e48934a6851d1dfdb6c54eea9..97fc60aee2e2a332ab954a6ddf9a0202b5310993 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -283,6 +283,46 @@
                 ],
               },
             }],
+            # 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',