presubmit: add depot_tools to PATH

BUG=584197

Review URL: https://codereview.chromium.org/1665233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298599 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/presubmit/__init__.py

 DEPS = [
+  'recipe_engine/path',
   'recipe_engine/python',
 ]

recipe_modules/presubmit/api.py

@@ -7,7 +7,14 @@ from recipe_engine import recipe_api
 class PresubmitApi(recipe_api.RecipeApi):
   def __call__(self, *args, **kwargs):
     """Return a presubmit step."""
+
     name = kwargs.pop('name', 'presubmit')
+
+    kwargs.setdefault('env', {})
+    kwargs['env'].setdefault('PATH', '%(PATH)s')
+    kwargs['env']['PATH'] = self.m.path.pathsep.join([
+        kwargs['env']['PATH'], str(self._module.PACKAGE_DIRECTORY)])
+
     return self.m.python(
         name, self.package_resource('presubmit_support.py'), list(args),
         **kwargs)

recipe_modules/presubmit/example.expected/basic.json

@@ -6,6 +6,9 @@
       "RECIPE_PACKAGE[depot_tools]/presubmit_support.py"
     ],
     "cwd": "[SLAVE_BUILD]",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE[depot_tools]"
+    },
     "name": "presubmit"
   },
   {