V8: Get build environment from MB

scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___builder.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "client.v8",
       "--builder",
       "V8 Linux64 - builder",
@@ skipping 367 matching lines @@
     "name": "package build"
   },
   {
     "cmd": [],
     "name": "trigger",
     "trigger_specs": [
       {
         "builder_name": "V8 Linux64",
         "properties": {
           "parent_build_environment": {
-            "GYP_DEFINES": "target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
-            "GYP_GENERATORS": "ninja"
+            "GYP_DEFINES": "target_arch=x64 cool_flag=a=1"

[Michael Achenbach, 2016/07/05 14:36:48]

The expectations change everywhere to whatever the step_test_data defines now.

           },
           "parent_got_revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "parent_got_revision_cp": "refs/heads/master@{#50110}",
           "parent_got_swarming_client_revision": "e4fee0b18f8163be6097c9c571640038896debc4",
           "revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "swarm_hashes": {
             "benchmarks": "[dummy hash for benchmarks]",
             "bot_default": "[dummy hash for bot_default]",
             "check-static-initializers": "[dummy hash for check-static-initializers]",
             "ignition": "[dummy hash for ignition]",
             "mjsunit": "[dummy hash for mjsunit]",
             "mozilla": "[dummy hash for mozilla]",
             "optimize_for_size": "[dummy hash for optimize_for_size]",
             "perf": "[dummy hash for perf]",
             "simdjs": "[dummy hash for simdjs]",
             "test262": "[dummy hash for test262]"
           }
         }
       },
       {
         "builder_name": "V8 Linux64 - avx2",
         "properties": {
           "parent_build_environment": {
-            "GYP_DEFINES": "target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
-            "GYP_GENERATORS": "ninja"
+            "GYP_DEFINES": "target_arch=x64 cool_flag=a=1"
           },
           "parent_got_revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "parent_got_revision_cp": "refs/heads/master@{#50110}",
           "parent_got_swarming_client_revision": "e4fee0b18f8163be6097c9c571640038896debc4",
           "revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "swarm_hashes": {
             "benchmarks": "[dummy hash for benchmarks]",
             "bot_default": "[dummy hash for bot_default]",
             "check-static-initializers": "[dummy hash for check-static-initializers]",
             "ignition": "[dummy hash for ignition]",
@@ skipping 20 matching lines @@
         "buildbot_changes": [
           {
             "author": "trigger_proxy",
             "revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c"
           }
         ],
         "builder_name": "v8_trigger_proxy",
         "properties": {
           "archive": "gs://chromium-v8/v8-linux64-rel",
           "parent_build_environment": {
-            "GYP_DEFINES": "target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
-            "GYP_GENERATORS": "ninja"
+            "GYP_DEFINES": "target_arch=x64 cool_flag=a=1"
           },
           "parent_got_revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "parent_got_revision_cp": "refs/heads/master@{#50110}",
           "parent_got_swarming_client_revision": "e4fee0b18f8163be6097c9c571640038896debc4",
           "revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "swarm_hashes": {
             "benchmarks": "[dummy hash for benchmarks]",
             "bot_default": "[dummy hash for bot_default]",
             "check-static-initializers": "[dummy hash for check-static-initializers]",
             "ignition": "[dummy hash for ignition]",
@@ skipping 10 matching lines @@
     "~followup_annotations": [
       "@@@STEP_TEXT@v8_trigger_proxy@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]