Recipes: make cwd default to slave_build

scripts/slave/recipes/chromium.expected/full_client_v8_Chrome_Linux_Perf.json

Index: scripts/slave/recipes/chromium.expected/full_client_v8_Chrome_Linux_Perf.json
diff --git a/scripts/slave/recipes/chromium.expected/full_client_v8_Chrome_Linux_Perf.json b/scripts/slave/recipes/chromium.expected/full_client_v8_Chrome_Linux_Perf.json
index 65e9e7e6699486e11a21b44ac8396f04c175bbde..39ed5f6aec7cfc109c0a4c57662e382149458313 100644
--- a/scripts/slave/recipes/chromium.expected/full_client_v8_Chrome_Linux_Perf.json
+++ b/scripts/slave/recipes/chromium.expected/full_client_v8_Chrome_Linux_Perf.json
@@ -23,6 +23,7 @@
       "--revision",
       "src/v8@22135"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -65,6 +66,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "branding=Chrome buildtype=Official component=static_library gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
     },
@@ -76,6 +78,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -98,6 +101,7 @@
       "--",
       "chromium_builder_perf"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -113,6 +117,7 @@
       "--num-shards",
       "1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "List Perf Tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -171,6 +176,7 @@
       "-v",
       "--b=2"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "blink_perf.all.exact",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[]@@@",
@@ -206,6 +212,7 @@
       "-v",
       "--b=2"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "blink_perf.all.release",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[]@@@",