Adds ability for builders to only compile targets affected by change

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium.linux",
       "--builder",
       "linux_chromium_browser_asan_rel",
@@ skipping 120 matching lines @@
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma-clang",
       "--goma-dir",
       "[BUILD]/goma",
       "--",
       "base_unittests",
       "mojo_common_unittests",
-      "browser_tests",
-      "chrome"
+      "browser_tests"
     ],
     "name": "compile (with patch)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/src/buildtools/checkdeps/checkdeps.py",
       "--json",
       "/path/to/tmp/json"
@@ skipping 149 matching lines @@
       "browser_tests",
       "--test-launcher-batch-limit=1",
       "--test-launcher-print-test-stdio=always"
     ],
     "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)"
   }
-]
+]