DevTools: Create recipe and builder for devtools

scripts/slave/recipes/devtools.expected/devtools_fyi_no_devtools_file.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
-      "tryserver.chromium.mac",
+      "chromium.fyi",
       "--builder",
-      "mac_upload_clang",
+      "Chromium DevTools Linux",
       "--slave",
       "TestSlavename",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\", \"src/buildtools\": \"got_buildtools_revision\", \"src/native_client\": \"got_nacl_revision\", \"src/third_party/angle\": \"got_angle_revision\", \"src/third_party/webrtc\": \"got_webrtc_revision\", \"src/tools/swarming_client\": \"got_swarming_client_revision\", \"src/v8\": \"got_v8_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
-      "--issue",
-      "12853011",
-      "--patchset",
-      "1",
-      "--rietveld_server",
-      "https://codereview.chromium.org",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@HEAD",
       "--force",
       "--output_manifest"
     ],
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ skipping 68 matching lines @@
       "@@@SET_BUILD_PROPERTY@got_v8_revision_cp@\"refs/heads/master@{#43426}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_swarming_client_revision_cp@\"refs/heads/master@{#276089}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_webrtc_revision_cp@\"refs/heads/master@{#120644}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_revision_cp@\"refs/heads/master@{#170242}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_angle_revision_cp@\"refs/heads/master@{#297276}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_buildtools_revision@\"f0319a328b2809876916353cb994259692140934\"@@@"
     ]
   },
   {
     "cmd": [
-      "python",
-      "-u",
-      "[SLAVE_BUILD]/src/third_party/binutils/download.py"
+      "git",
+      "diff",
+      "--cached",
+      "--name-only"
     ],
-    "name": "download binutils"
+    "cwd": "[SLAVE_BUILD]/src",
+    "name": "git diff to analyze patch",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@files@foo.cc@@@",
+      "@@@STEP_LOG_END@files@@@"
+    ]
   },
   {
     "cmd": [
-      "python",
-      "-u",
-      "[SLAVE_BUILD]/src/tools/clang/scripts/package.py",
-      "--upload"
+      "echo",
+      "no devtools file in patch"
     ],
-    "name": "package clang"
+    "name": "skip checks"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]