Recipes: make cwd default to slave_build

scripts/slave/recipes/chromium.expected/full_chromium_fyi_Print_Preview_Linux.json

Index: scripts/slave/recipes/chromium.expected/full_chromium_fyi_Print_Preview_Linux.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Print_Preview_Linux.json b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Print_Preview_Linux.json
index 50e1197f303fb5801c409ec72113661cf951264a..39b77a54b85ca1a593153d1f7d242435ac6aeb6c 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Print_Preview_Linux.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Print_Preview_Linux.json
@@ -21,6 +21,7 @@
       "--revision",
       "src@HEAD"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -67,6 +68,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "component=shared_library gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
     },
@@ -80,6 +82,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/chromium.fyi.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/chromium.fyi.json@@@",
@@ -102,6 +105,7 @@
       "--properties",
       "{\"buildername\": \"Print Preview Linux\", \"buildnumber\": 571, \"mastername\": \"chromium.fyi\", \"slavename\": \"TestSlavename\", \"target_platform\": \"linux\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
@@ -114,6 +118,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -135,6 +140,7 @@
       "blink_tests",
       "browser_tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -159,6 +165,7 @@
       "--platform",
       "browser_test.linux"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },