Changed recipe_modules base paths to be abstract entities in their own right.

scripts/slave/recipes/skia/skia.expected/failed_dm.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "config",
       "--spec",
       "cache_dir = None\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]"
     ],
@@ skipping 102 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@    print \"%s exists but is not a dir\" % path@@@",
       "@@@STEP_LOG_LINE@python.inline@    sys.exit(1)@@@",
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/recipe_modules/gsutil/resources/gsutil_wrapper.py",
+      "RECIPE_MODULE[gsutil]/resources/gsutil_wrapper.py",
       "--",
       "[DEPOT_TOOLS]/gsutil.py",
       "--force-version",
       "3.25",
       "--",
       "cp",
       "-R",
       "gs://chromium-skia-gm/playback_42/skps",
       "[SLAVE_BUILD]/playback"
     ],
@@ skipping 46 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@    print \"%s exists but is not a dir\" % path@@@",
       "@@@STEP_LOG_LINE@python.inline@    sys.exit(1)@@@",
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/recipe_modules/gsutil/resources/gsutil_wrapper.py",
+      "RECIPE_MODULE[gsutil]/resources/gsutil_wrapper.py",
       "--",
       "[DEPOT_TOOLS]/gsutil.py",
       "--force-version",
       "3.25",
       "--",
       "cp",
       "-R",
       "gs://chromium-skia-gm/skimage/input/*",
       "[SLAVE_BUILD]/images"
     ],
@@ skipping 93 matching lines @@
     "name": "dm",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/recipe_modules/skia/resources/upload_dm_results.py",
+      "RECIPE_MODULE[skia]/resources/upload_dm_results.py",
       "[SLAVE_BUILD]/dm",
       "164710",
       "Test-Ubuntu13.10-ShuttleA-NoGPU-x86_64-Debug-Recipes",
       "6",
       "",
       "[SLAVE_BUILD]/skia/common/py/utils"
     ],
     "cwd": "[SLAVE_BUILD]/skia",
     "name": "Upload DM Results"
   },
@@ skipping 25 matching lines @@
       "--dummy-flags"
     ],
     "name": "nanobench"
   },
   {
     "name": "$final_result",
     "reason": "Failed build steps: dm",
     "status_code": 1
   }
 ]