Recipes: make cwd default to slave_build

scripts/slave/recipe_modules/chromite/example.expected/basic.json

Index: scripts/slave/recipe_modules/chromite/example.expected/basic.json
diff --git a/scripts/slave/recipe_modules/chromite/example.expected/basic.json b/scripts/slave/recipe_modules/chromite/example.expected/basic.json
index 59853f814eb196c45dc94cbcc8a2f2fe3c551010..6c865843bd5d497a7e6f2721a392b069a0e4ddcb 100644
--- a/scripts/slave/recipe_modules/chromite/example.expected/basic.json
+++ b/scripts/slave/recipe_modules/chromite/example.expected/basic.json
@@ -8,6 +8,7 @@
       "--repo-url",
       "https://chromium.googlesource.com/external/repo.git"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "repo init"
   },
   {
@@ -15,6 +16,7 @@
       "[DEPOT_TOOLS]/repo",
       "sync"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "repo sync"
   },
   {
@@ -29,6 +31,7 @@
       "--board",
       "amd64-generic"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "setup board"
   },
   {
@@ -41,6 +44,7 @@
       "--board",
       "amd64-generic"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "build packages"
   },
   {
@@ -53,6 +57,7 @@
       "echo",
       "hello"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cros_sdk"
   },
   {
@@ -64,6 +69,7 @@
       "/here/there",
       "amd64-generic-full"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cbuildbot"
   }
 ]