Recipes: make cwd default to slave_build

scripts/slave/recipes/chromium_gn.expected/full_tryserver_blink_android_chromium_gn_compile_rel.json

Index: scripts/slave/recipes/chromium_gn.expected/full_tryserver_blink_android_chromium_gn_compile_rel.json
diff --git a/scripts/slave/recipes/chromium_gn.expected/full_tryserver_blink_android_chromium_gn_compile_rel.json b/scripts/slave/recipes/chromium_gn.expected/full_tryserver_blink_android_chromium_gn_compile_rel.json
index aea18383b9b998f1fe7ebd785713a0a21f20ff06..9a5b58c59eb529b7bf66c69ebe4f61401e90b8ba 100644
--- a/scripts/slave/recipes/chromium_gn.expected/full_tryserver_blink_android_chromium_gn_compile_rel.json
+++ b/scripts/slave/recipes/chromium_gn.expected/full_tryserver_blink_android_chromium_gn_compile_rel.json
@@ -30,6 +30,7 @@
       "src/third_party/WebKit@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -76,6 +77,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_CHROMIUM_NO_ACTION": "1"
     },
@@ -98,6 +100,7 @@
       "[BUILD]/goma",
       "//out/Release"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "Generate build files"
   },
   {
@@ -108,6 +111,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/tryserver.blink.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/tryserver.blink.json@@@",
@@ -144,6 +148,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/trybot_analyze_config.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read filter exclusion spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: 'testing/buildbot/trybot_analyze_config.json'@@@",
@@ -176,6 +181,7 @@
       "{\"files\": [\"foo.cc\"], \"targets\": [\"base_unittests_apk\", \"chrome_shell_apk\"]}",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "analyze",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -227,6 +233,7 @@
       "--",
       "base_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -238,6 +245,7 @@
       "check",
       "//out/Release"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gn check"
   }
 ]