Recipes: make cwd default to slave_build

scripts/slave/recipes/mojo.expected/mojo_android_builder.json

Index: scripts/slave/recipes/mojo.expected/mojo_android_builder.json
diff --git a/scripts/slave/recipes/mojo.expected/mojo_android_builder.json b/scripts/slave/recipes/mojo.expected/mojo_android_builder.json
index ac649159027b4523719755bef1e718350af79ba0..02090b8988d9338edd2249def0a935c2c1d90758 100644
--- a/scripts/slave/recipes/mojo.expected/mojo_android_builder.json
+++ b/scripts/slave/recipes/mojo.expected/mojo_android_builder.json
@@ -22,6 +22,7 @@
       "src@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -43,6 +44,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gclient runhooks"
   },
   {
@@ -69,6 +71,7 @@
       "--release",
       "--android"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GOMA_DIR": "[BUILD]/goma"
     },
@@ -81,6 +84,7 @@
       "[SLAVE_BUILD]/src/mojo/tools/upload_binaries.py",
       "--android"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "upload shell and app binaries"
   }
 ]