Recipes: make cwd default to slave_build

scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_fyi_Mac_Builder.json

Index: scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_fyi_Mac_Builder.json
diff --git a/scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_fyi_Mac_Builder.json b/scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_fyi_Mac_Builder.json
index feecc7748ec5f59ef33d61be36fd11745ee5886c..c26438628af1f2ed7dacbb8826f8a120b7e72fc3 100644
--- a/scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_fyi_Mac_Builder.json
+++ b/scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_fyi_Mac_Builder.json
@@ -25,6 +25,7 @@
       "--revision",
       "src/third_party/webrtc@HEAD"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -79,6 +80,7 @@
       "RECIPE_MODULE[webrtc]/resources/cleanup_files.py",
       "[SLAVE_BUILD]/src/out"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "clean test output files"
   },
   {
@@ -87,6 +89,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -96,6 +99,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "blink_logging_always_on=1 clang=1 component=static_library dcheck_always_on=1 gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
     },
@@ -119,6 +123,7 @@
       "--",
       "chromium_builder_webrtc"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -151,6 +156,7 @@
       "--platform",
       "mac"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "sizes"
   },
   {
@@ -170,10 +176,12 @@
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Mac Builder\", \"buildnumber\": 571, \"got_libjingle_revision\": \"1161aa63\", \"got_revision\": \"c321321\", \"got_webrtc_revision\": \"deadbeef\", \"mastername\": \"chromium.webrtc.fyi\", \"parent_buildername\": null, \"recipe\": \"webrtc/chromium\", \"revision\": \"deadbeef\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "package build"
   },
   {
     "cmd": [],
+    "cwd": "[SLAVE_BUILD]",
     "name": "trigger",
     "trigger_specs": [
       {