Recipes: make cwd default to slave_build

scripts/slave/recipes/mojo.expected/mojo_linux_nacl.json

Index: scripts/slave/recipes/mojo.expected/mojo_linux_nacl.json
diff --git a/scripts/slave/recipes/mojo.expected/mojo_linux_nacl.json b/scripts/slave/recipes/mojo.expected/mojo_linux_nacl.json
index 43f0229627baec2105cd0608709493c95c926053..83486fb65755441ea98ded4d839702aeaf1710ad 100644
--- a/scripts/slave/recipes/mojo.expected/mojo_linux_nacl.json
+++ b/scripts/slave/recipes/mojo.expected/mojo_linux_nacl.json
@@ -22,6 +22,7 @@
       "src@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -43,6 +44,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gclient runhooks"
   },
   {
@@ -68,6 +70,7 @@
       "build",
       "--release"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GOMA_DIR": "[BUILD]/goma"
     },
@@ -81,6 +84,7 @@
       "{\"build_number\": 571, \"builder_name\": \"Mojo Linux NaCl\", \"dcheck_always_on\": false, \"is_debug\": false, \"master_name\": \"chromium.testing.master\", \"target_os\": \"linux\", \"test_results_server\": \"test-results.appspot.com\", \"test_types\": [\"default\", \"nacl\"]}",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "get_test_list",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[@@@",
@@ -101,4 +105,4 @@
     "cwd": "[SLAVE_BUILD]/src",
     "name": "Hello"
   }
-]
+]