Enable goma on pdfium buildbots by default.

scripts/slave/recipes/pdfium.expected/try-linux_xfa_asan_lsan.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
       "--patch_root",
       "pdfium",
@@ skipping 41 matching lines @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]/pdfium",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
+    "cmd": [],
+    "name": "ensure_goma"
+  },
+  {
     "cmd": [
       "python",
       "-u",
+      "RECIPE_MODULE[depot_tools::cipd]/resources/bootstrap.py",
+      "--platform",
+      "linux-amd64",
+      "--dest-directory",
+      "[SLAVE_BUILD]/cipd",
+      "--json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_goma.install cipd",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@cipd instance_id: 40-chars-fake-of-the-package-instance_id@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"executable\": \"[SLAVE_BUILD]/cipd/cipd\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"instance_id\": \"40-chars-fake-of-the-package-instance_id\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[SLAVE_BUILD]/cipd/cipd",
+      "ensure",
+      "--root",
+      "[CACHE]/cipd/goma",
+      "--list",
+      "infra/tools/cloudtail/linux-amd64 goma_recipe_module\ninfra_internal/goma/client/linux-amd64 release",
+      "--json-output",
+      "/path/to/tmp/json",
+      "--service-account-json",
+      "/creds/service_accounts/service-account-goma-client.json"
+    ],
+    "name": "ensure_goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@    {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"instance_id\": \"resolved-instance_id-of-goma_recipe_modu\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"package\": \"infra/tools/cloudtail/linux-amd64\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"package\": \"infra_internal/goma/client/linux-amd64\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  ]@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "[DEPOT_TOOLS]/gn.py",
       "--root=[SLAVE_BUILD]/pdfium",
       "gen",
       "//out/debug_xfa_v8_asan",
-      "--args=is_debug=true is_component_build=false pdf_enable_v8=true pdf_enable_xfa=true pdf_use_skia=false pdf_is_standalone=true use_sysroot=false is_asan=true is_lsan=true"
+      "--args=is_debug=true is_component_build=false pdf_enable_v8=true pdf_enable_xfa=true pdf_use_skia=false pdf_is_standalone=true use_goma=true goma_dir=\"[CACHE]/cipd/goma\" use_sysroot=false is_asan=true is_lsan=true"
     ],
     "cwd": "[SLAVE_BUILD]/pdfium",
     "name": "gn gen"
   },
   {
     "cmd": [
+      "python",
+      "-u",
+      "\nimport multiprocessing\nimport sys\n\njob_limit = 200\nif sys.platform.startswith('linux'):\n  # Use 80 for linux not to load goma backend.\n  job_limit = 80\n\ntry:\n  jobs = min(job_limit, multiprocessing.cpu_count() * 10)\nexcept NotImplementedError:\n  jobs = 50\n\nprint jobs\n"
+    ],
+    "name": "calculate the number of recommended jobs",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@import multiprocessing@@@",
+      "@@@STEP_LOG_LINE@python.inline@import sys@@@",
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@job_limit = 200@@@",
+      "@@@STEP_LOG_LINE@python.inline@if sys.platform.startswith('linux'):@@@",
+      "@@@STEP_LOG_LINE@python.inline@  # Use 80 for linux not to load goma backend.@@@",
+      "@@@STEP_LOG_LINE@python.inline@  job_limit = 80@@@",
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@try:@@@",
+      "@@@STEP_LOG_LINE@python.inline@  jobs = min(job_limit, multiprocessing.cpu_count() * 10)@@@",
+      "@@@STEP_LOG_LINE@python.inline@except NotImplementedError:@@@",
+      "@@@STEP_LOG_LINE@python.inline@  jobs = 50@@@",
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@print jobs@@@",
+      "@@@STEP_LOG_END@python.inline@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "[CACHE]/cipd/goma/goma_ctl.py",
+      "restart"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "start_goma"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[build::goma]/resources/cloudtail_utils.py",
+      "start",
+      "--cloudtail-path",
+      "[CACHE]/cipd/goma/cloudtail",
+      "--pid-file",
+      "[TMP_BASE]/cloudtail.pid"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "start cloudtail"
+  },
+  {
+    "cmd": [
       "ninja",
       "-C",
-      "[SLAVE_BUILD]/pdfium/out/debug_xfa_v8_asan"
+      "[SLAVE_BUILD]/pdfium/out/debug_xfa_v8_asan",
+      "-j",
+      "50"
     ],
     "name": "compile with ninja"
   },
   {
     "cmd": [
+      "python",
+      "-u",
+      "[CACHE]/cipd/goma/goma_ctl.py",
+      "jsonstatus",
+      "[CACHE]/cipd/goma/jsonstatus"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "goma_jsonstatus"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "[CACHE]/cipd/goma/goma_ctl.py",
+      "stat"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "goma_stat"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "[CACHE]/cipd/goma/goma_ctl.py",
+      "stop"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "stop_goma"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_PACKAGE_REPO[build]/scripts/slave/upload_goma_logs.py",
+      "--upload-compiler-proxy-info",
+      "--json-status",
+      "[CACHE]/cipd/goma/jsonstatus",
+      "--ninja-log-outdir",
+      "[SLAVE_BUILD]/pdfium/out/debug_xfa_v8_asan",
+      "--ninja-log-compiler",
+      "unknown",
+      "--ninja-log-command",
+      "['ninja', '-C', Path('checkout', 'out','debug_xfa_v8_asan'), '-j', 50]",
+      "--ninja-log-exit-status",
+      "0",
+      "--buildbot-buildername",
+      "linux_xfa_asan_lsan",
+      "--buildbot-mastername",
+      "tryserver.client.pdfium",
+      "--buildbot-slavename",
+      "TestSlavename"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "upload_log"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[build::goma]/resources/cloudtail_utils.py",
+      "stop",
+      "--killed-pid-file",
+      "[TMP_BASE]/cloudtail.pid"
+    ],
+    "name": "stop cloudtail"
+  },
+  {
+    "cmd": [
       "[SLAVE_BUILD]/pdfium/out/debug_xfa_v8_asan/pdfium_unittests"
     ],
     "cwd": "[SLAVE_BUILD]/pdfium",
     "env": {
       "ASAN_OPTIONS": "detect_leaks=1:allocator_may_return_null=1"
     },
     "name": "unittests"
   },
   {
     "cmd": [
@@ skipping 45 matching lines @@
     "env": {
       "ASAN_OPTIONS": "detect_leaks=1:allocator_may_return_null=1"
     },
     "name": "corpus tests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
-]
+]