Recipes: make cwd default to slave_build

scripts/slave/recipes/codesearch.expected/codesearch_test.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "config",
       "--spec",
       "cache_dir = None\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk'}]\ntarget_os = ['android']"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gclient setup"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "sync",
       "--nohooks",
       "--force",
       "--verbose",
       "--delete_unversioned_trees",
       "--revision",
       "src@refs/remotes/origin/master",
       "--output-json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gclient sync",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"solutions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"src/\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"revision\": 170242@@@",
       "@@@STEP_LOG_LINE@json.output@    }, @@@",
       "@@@STEP_LOG_LINE@json.output@    \"src/native_client/\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"revision\": 274981@@@",
       "@@@STEP_LOG_LINE@json.output@    }, @@@",
@@ skipping 20 matching lines @@
       "@@@SET_BUILD_PROPERTY@got_v8_revision@43426@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_CROSSCOMPILE": "1",
       "GYP_DEFINES": "OS=android clang=1 component=static_library fastbuild=1 gomadir='[BUILD]/goma' target_arch=arm use_goma=1",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "ninja",
       "-C",
       "[SLAVE_BUILD]/src/out/Debug",
       "all",
       "-t",
       "compdb",
       "cc",
       "cxx",
       "objc",
       "objcxx"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "generate compilation database",
     "stdout": "/path/to/tmp/"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/compile.py",
       "--target",
       "Debug",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma-clang",
       "--goma-dir",
       "[BUILD]/goma",
       "--",
       "all"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "compile"
   },
   {
     "cmd": [
       "cp",
       "some compilation data",
       "[SLAVE_BUILD]/src/out/Debug/compile_commands.json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "copy compilation database"
   },
   {
     "cmd": [
       "tools/clang/scripts/update.sh",
       "--force-local-build",
       "--without-android",
       "--with-chrome-tools",
       "translation_unit"
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "name": "compile translation_unit clang tool"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/src/tools/clang/scripts/run_tool.py",
       "[SLAVE_BUILD]/src/third_party/llvm-build/Release+Asserts/bin/translation_unit",
       "[SLAVE_BUILD]/src/out/Debug",
       "--all"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "run translation_unit clang tool"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/chromium/package_index.py",
       "--path-to-compdb",
       "[SLAVE_BUILD]/src/out/Debug/compile_commands.json",
       "--path-to-archive-output",
       "[SLAVE_BUILD]/src/out/Debug/index_pack.zip"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "create index pack"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport os, sys\nfrom common import chromium_utils\n\nif os.path.exists(sys.argv[1]):\n  chromium_utils.RemoveDirectory(sys.argv[1])\n",
       "[SLAVE_BUILD]/src/third_party/llvm-build"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "rmtree llvm-build",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import os, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@from common import chromium_utils@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@if os.path.exists(sys.argv[1]):@@@",
       "@@@STEP_LOG_LINE@python.inline@  chromium_utils.RemoveDirectory(sys.argv[1])@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[gsutil]/resources/gsutil_wrapper.py",
       "--",
       "[DEPOT_TOOLS]/gsutil.py",
       "--force-version",
       "3.25",
       "--",
       "cp",
       "[SLAVE_BUILD]/src/out/Debug/index_pack.zip",
       "gs://chrome-codesearch/index_pack_571.zip"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gsutil upload index pack",
     "~followup_annotations": [
       "@@@STEP_LINK@gsutil.upload@https://storage.cloud.google.com/chrome-codesearch/index_pack_571.zip@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/archive_source_codesearch.py",
       "src",
       "src-internal",
       "-f",
       "src.tar.bz2"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "archive source"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[gsutil]/resources/gsutil_wrapper.py",
       "--",
       "[DEPOT_TOOLS]/gsutil.py",
       "--force-version",
       "3.25",
       "--",
       "cp",
       "[SLAVE_BUILD]/src.tar.bz2",
       "gs://chrome-codesearch/src_571.tar.bz2"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gsutil upload source tarball",
     "~followup_annotations": [
       "@@@STEP_LINK@gsutil.upload@https://storage.cloud.google.com/chrome-codesearch/src_571.tar.bz2@@@"
     ]
   }
 ]