Adds ability for builders to only compile targets affected by change

scripts/slave/recipes/chromium_trybot.expected/persistent_failure_and_runhooks_2_fail_test.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\bot_update.py",
       "--master",
       "tryserver.chromium.win",
       "--builder",
       "win_chromium_rel",
@@ skipping 118 matching lines @@
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--goma-dir",
       "[BUILD]\\goma",
       "--",
-      "chrome",
-      "chrome",
       "base_unittests",
-      "browser_tests",
-      "chrome"
+      "browser_tests"
     ],
     "name": "compile (with patch)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]\\src\\tools\\deps2git\\deps2git.py",
       "-d",
       "[SLAVE_BUILD]\\src\\DEPS",
@@ skipping 25 matching lines @@
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\runtest.py",
       "--target",
       "Release",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"win_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.win\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"win_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.win\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--annotate=gtest",
-      "--test-type=telemetry_unittests",
-      "--builder-name=win_chromium_rel",
-      "--slave-name=TestSlavename",
-      "--build-number=571",
-      "--run-python-script",
-      "[SLAVE_BUILD]\\src\\tools\\telemetry\\run_tests",
-      "--browser=release",
-      "--retry-limit=3",
-      "--write-full-results-to",
-      "/path/to/tmp/json"
-    ],
-    "name": "telemetry_unittests (with patch)"
-  },
-  {
-    "allow_subannotations": true,
-    "cmd": [
-      "python",
-      "-u",
-      "[BUILD]\\scripts\\slave\\runtest.py",
-      "--target",
-      "Release",
-      "--factory-properties",
-      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"win_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.win\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
-      "--build-properties",
-      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"win_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.win\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
-      "--annotate=gtest",
-      "--test-type=telemetry_perf_unittests",
-      "--builder-name=win_chromium_rel",
-      "--slave-name=TestSlavename",
-      "--build-number=571",
-      "--run-python-script",
-      "[SLAVE_BUILD]\\src\\tools\\perf\\run_tests",
-      "--browser=release",
-      "--retry-limit=3",
-      "--write-full-results-to",
-      "/path/to/tmp/json"
-    ],
-    "name": "telemetry_perf_unittests (with patch)"
-  },
-  {
-    "allow_subannotations": true,
-    "cmd": [
-      "python",
-      "-u",
-      "[BUILD]\\scripts\\slave\\runtest.py",
-      "--target",
-      "Release",
-      "--factory-properties",
-      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"win_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.win\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
-      "--build-properties",
-      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"win_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.win\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
-      "--annotate=gtest",
       "--test-type=base_unittests",
       "--test-launcher-summary-output",
       "/path/to/tmp/json",
       "--builder-name=win_chromium_rel",
       "--slave-name=TestSlavename",
       "--build-number=571",
       "base_unittests.exe"
     ],
     "name": "base_unittests (with patch)",
     "~followup_annotations": [
@@ skipping 22 matching lines @@
       "--slave-name=TestSlavename",
       "--build-number=571",
       "browser_tests.exe"
     ],
     "name": "browser_tests (with patch)"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]\\src\\chrome\\test\\nacl_test_injection\\buildbot_nacl_integration.py",
-      "--mode",
-      "Release",
-      "--json_build_results_output_file",
-      "/path/to/tmp/json"
-    ],
-    "name": "nacl_integration (with patch)",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@json.output@[]@@@",
-      "@@@STEP_LOG_END@json.output@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
       "[SLAVE_BUILD]\\src\\mojo\\tools\\run_mojo_python_tests.py",
       "--write-full-results-to",
       "/path/to/tmp/json"
     ],
     "name": "mojo_python_tests (with patch)"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 147 matching lines @@
       "@@@STEP_LOG_END@python.inline@@@",
       "@@@STEP_WARNINGS@@@"
     ]
   },
   {
     "name": "$final_result",
     "reason": "Step('gclient runhooks (2)') failed with return_code 1",
     "status_code": 1
   }
 ]