Recipes: make cwd default to slave_build

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

Index: scripts/slave/recipes/mojo.expected/mojo_linux.json
diff --git a/scripts/slave/recipes/mojo.expected/mojo_linux.json b/scripts/slave/recipes/mojo.expected/mojo_linux.json
index 6c5a0e4c30155713a8ec102d68cd114dde220519..6313ff6b16fb55501d0392f9c37e9451a34c3440 100644
--- a/scripts/slave/recipes/mojo.expected/mojo_linux.json
+++ b/scripts/slave/recipes/mojo.expected/mojo_linux.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"
   },
   {
@@ -67,6 +69,7 @@
       "build",
       "--release"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GOMA_DIR": "[BUILD]/goma"
     },
@@ -80,6 +83,7 @@
       "{\"build_number\": 571, \"builder_name\": \"Mojo Linux\", \"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\"]}",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "get_test_list",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[@@@",
@@ -106,6 +110,7 @@
       "-u",
       "[SLAVE_BUILD]/src/mojo/tools/upload_binaries.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "upload shell and app binaries"
   }
 ]