Recipes: make cwd default to slave_build

scripts/slave/recipes/gpu/download_and_test.expected/linux_debug.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup temp"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/git_setup.py",
       "--path",
       "[SLAVE_BUILD]/swarming.client",
       "--url",
       "https://chromium.googlesource.com/external/swarming.client.git"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "git setup (swarming_client)"
   },
   {
     "cmd": [
       "git",
       "retry",
       "fetch",
       "origin",
       "feaaabcdef"
     ],
@@ skipping 40 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]/swarming.client",
     "name": "submodule update (swarming_client)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "exit()"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "copy parent_got_revision to got_revision",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@exit()@@@",
       "@@@STEP_LOG_END@python.inline@@@",
       "@@@SET_BUILD_PROPERTY@got_revision@160000@@@"
     ]
   },
   {
     "cmd": [
       "killall",
       "-9",
       "gnome-keyring-daemon"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "killall gnome-keyring-daemon"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Debug",
@@ skipping 16 matching lines @@
       "--webkit-revision=10000",
       "--master-class-name=ChromiumGPUTesting",
       "[SLAVE_BUILD]/swarming.client/run_isolated.py",
       "-H",
       "[dummy hash for content_gl_tests]",
       "-I",
       "https://isolateserver.appspot.com",
       "--",
       "--use-gpu-in-tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "content_gl_tests"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Debug",
@@ skipping 16 matching lines @@
       "--webkit-revision=10000",
       "--master-class-name=ChromiumGPUTesting",
       "[SLAVE_BUILD]/swarming.client/run_isolated.py",
       "-H",
       "[dummy hash for gl_tests]",
       "-I",
       "https://isolateserver.appspot.com",
       "--",
       "--use-gpu-in-tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "gl_tests"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Debug",
@@ skipping 16 matching lines @@
       "--webkit-revision=10000",
       "--master-class-name=ChromiumGPUTesting",
       "[SLAVE_BUILD]/swarming.client/run_isolated.py",
       "-H",
       "[dummy hash for angle_unittests]",
       "-I",
       "https://isolateserver.appspot.com",
       "--",
       "--use-gpu-in-tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "angle_unittests"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Debug",
@@ skipping 28 matching lines @@
       "--build-revision",
       "160000",
       "--test-machine-name",
       "linux debug tester",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "maps_pixel_test",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 39 matching lines @@
       "--os-type",
       "linux",
       "--test-machine-name",
       "linux debug tester",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "pixel_test",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "webgl_conformance_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "context_lost_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "memory_test",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "trace_test",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "screenshot_sync_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "hardware_accelerated_feature_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 30 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v",
       "--use-devtools-active-port",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "gpu_process_launch_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 34 matching lines @@
       "--build-revision",
       "160000",
       "--test-machine-name",
       "linux debug tester",
       "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
       "--output-format",
       "json",
       "--output-dir",
       "/path/to/tmp/"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "gpu_rasterization_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>failures:<br/>Test.Test1<br/>@@@"
     ]
   }
 ]