Adds ability for builders to only compile targets affected by change

scripts/slave/recipes/chromium_trybot.expected/full_tryserver_chromium_win_win8_chromium_rel.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\bot_update.py",
       "--master",
       "tryserver.chromium.win",
       "--builder",
       "win8_chromium_rel",
@@ skipping 119 matching lines @@
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--goma-dir",
       "[BUILD]\\goma",
       "--",
       "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 62 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)"
   }
 ]