Recipes: make cwd default to slave_build

scripts/slave/recipes/gpu/build_and_upload.expected/mac_debug.json

Index: scripts/slave/recipes/gpu/build_and_upload.expected/mac_debug.json
diff --git a/scripts/slave/recipes/gpu/build_and_upload.expected/mac_debug.json b/scripts/slave/recipes/gpu/build_and_upload.expected/mac_debug.json
index 3c8f2e998cacb5e632ae91037fb9c4d84b72beef..21ce62969f8c4eea722ec111151028e9e4505eb7 100644
--- a/scripts/slave/recipes/gpu/build_and_upload.expected/mac_debug.json
+++ b/scripts/slave/recipes/gpu/build_and_upload.expected/mac_debug.json
@@ -5,6 +5,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup temp"
   },
   {
@@ -30,6 +31,7 @@
       "src@204787",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -76,6 +78,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "archive_gpu_tests=1 blink_logging_always_on=1 clang=1 component=shared_library dcheck_always_on=1 disable_glibcxx_debug=1 ffmpeg_branding=Chrome gomadir='[BUILD]/goma' internal_gles2_conform_tests=1 proprietary_codecs=1 target_arch=x64 test_isolation_mode=prepare use_goma=1"
     },
@@ -90,6 +93,7 @@
       "[SLAVE_BUILD]/src/out/Debug",
       "--clean-isolated-files"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "clean isolated files"
   },
   {
@@ -118,6 +122,7 @@
       "tab_capture_end2end_tests_run",
       "telemetry_gpu_test_run"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -140,6 +145,7 @@
       "[SLAVE_BUILD]/src/out/Debug/tab_capture_end2end_tests.isolated.gen.json",
       "[SLAVE_BUILD]/src/out/Debug/telemetry_gpu_test.isolated.gen.json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "isolate tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",