Recipes: make cwd default to slave_build

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_linux_Cast_Linux.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_linux_Cast_Linux.json b/scripts/slave/recipes/chromium.expected/full_chromium_linux_Cast_Linux.json
index 31ae17f419e4e507fe33032574e70ebf45034fe3..1c197a80c367ba028324a9ad6c6e8eebc535daa1 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_linux_Cast_Linux.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_linux_Cast_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": "chromecast=1 clang=1 component=static_library gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
     },
@@ -80,6 +82,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/chromium.linux.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/chromium.linux.json@@@",
@@ -102,6 +105,7 @@
       "--properties",
       "{\"buildername\": \"Cast Linux\", \"buildnumber\": 571, \"mastername\": \"chromium.linux\", \"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 @@
       "All",
       "chromium_builder_tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   }
 ]