Recipes: make cwd default to slave_build

scripts/slave/recipe_modules/ios/example.expected/basic.json

Index: scripts/slave/recipe_modules/ios/example.expected/basic.json
diff --git a/scripts/slave/recipe_modules/ios/example.expected/basic.json b/scripts/slave/recipe_modules/ios/example.expected/basic.json
index e2ecd9afc9159ffa5a8c5e24ca716bf7363bb9ba..e421476c92ff1e28de99abb64a79748b1bf6bc49 100644
--- a/scripts/slave/recipe_modules/ios/example.expected/basic.json
+++ b/scripts/slave/recipe_modules/ios/example.expected/basic.json
@@ -22,6 +22,7 @@
       "src@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -69,6 +70,7 @@
       "[SLAVE_BUILD]/src/ios/build/bots/chromium.fake/ios.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read build config",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -111,6 +113,7 @@
       "[SLAVE_BUILD]/src/ios/build/bots/tests/fake include.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "include fake include.json",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -132,6 +135,7 @@
       "-e",
       "{\n  \"GYP_DEFINES\": {\n    \"OS\": \"ios\", \n    \"component\": \"static_library\"\n  }, \n  \"compiler\": \"xcodebuild\", \n  \"configuration\": \"Debug\", \n  \"sdk\": \"iphonesimulator8.1\", \n  \"tests\": [\n    {\n      \"app\": \"fake test 1\", \n      \"device type\": \"fake device 1\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake included test 1\", \n      \"device type\": \"fake device 1\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake included test 2\", \n      \"device type\": \"fake device 1\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake test 2\", \n      \"device type\": \"fake device 2\", \n      \"os\": \"7.1\"\n    }, \n    {\n      \"app\": \"fake included test 1\", \n      \"device type\": \"fake device 2\", \n      \"os\": \"7.1\"\n    }, \n    {\n      \"app\": \"fake included test 2\", \n      \"device type\": \"fake device 2\", \n      \"os\": \"7.1\"\n    }\n  ], \n  \"triggered bots\": {}, \n  \"xcode version\": \"6.1.1\"\n}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "finalize build config"
   },
   {
@@ -142,6 +146,7 @@
       "--version",
       "6.1.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "find xcode",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
@@ -155,6 +160,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "component=static_library OS=ios",
       "GYP_GENERATORS": "xcode",
@@ -193,6 +199,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake test 1 (fake device 1 iOS 8.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -227,6 +234,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake included test 1 (fake device 1 iOS 8.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -261,6 +269,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake included test 2 (fake device 1 iOS 8.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -295,6 +304,7 @@
       "--version",
       "7.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake test 2 (fake device 2 iOS 7.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -329,6 +339,7 @@
       "--version",
       "7.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake included test 1 (fake device 2 iOS 7.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -363,6 +374,7 @@
       "--version",
       "7.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake included test 2 (fake device 2 iOS 7.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",