WebRTC: Add Libfuzzer commit and trybot.

scripts/slave/recipes/webrtc/libfuzzer.expected/full_tryserver_webrtc_linux_libfuzzer_rel.json

Index: scripts/slave/recipes/webrtc/libfuzzer.expected/full_tryserver_webrtc_linux_libfuzzer_rel.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_gn_rel.json b/scripts/slave/recipes/webrtc/libfuzzer.expected/full_tryserver_webrtc_linux_libfuzzer_rel.json
similarity index 77%
copy from scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_gn_rel.json
copy to scripts/slave/recipes/webrtc/libfuzzer.expected/full_tryserver_webrtc_linux_libfuzzer_rel.json
index 1dd9b48b85f48555a6543270dcf38b91d4014664..aadec3f3c09a9a225a45b9797f553cc59a07f553 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_gn_rel.json
+++ b/scripts/slave/recipes/webrtc/libfuzzer.expected/full_tryserver_webrtc_linux_libfuzzer_rel.json
@@ -7,9 +7,9 @@
       "--master",
       "tryserver.webrtc",
       "--builder",
-      "linux_gn_rel",
+      "linux_libfuzzer_rel",
       "--slave",
-      "slavename",
+      "TestSlavename",
       "--spec",
       "cache_dir = None\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/webrtc'}, {'deps_file': 'DEPS', 'managed': True, 'name': 'webrtc-limited', 'url': 'https://chrome-internal.googlesource.com/chrome/deps/webrtc-limited'}]",
       "--root",
@@ -17,15 +17,15 @@
       "--revision_mapping_file",
       "{\"src\": \"got_revision\"}",
       "--issue",
-      "666666",
+      "12853011",
       "--patchset",
       "1",
       "--rietveld_server",
-      "https://fake.rietveld.url",
+      "https://codereview.chromium.org",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
-      "src@12345",
+      "src@HEAD",
       "--output_manifest"
     ],
     "cwd": "[SLAVE_BUILD]",
@@ -58,34 +58,40 @@
     "cmd": [
       "python",
       "-u",
-      "RECIPE_MODULE[webrtc]/resources/cleanup_files.py",
-      "[SLAVE_BUILD]/src/out"
+      "[DEPOT_TOOLS]/gclient.py",
+      "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "clean test output files"
+    "env": {
+      "GYP_CHROMIUM_NO_ACTION": "1",
+      "GYP_DEFINES": "component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
+    },
+    "name": "gclient runhooks"
   },
   {
     "cmd": [
-      "python",
-      "-u",
-      "[BUILD]/scripts/slave/cleanup_temp.py"
+      "tools/clang/scripts/update.py",
+      "--force-local-build",
+      "--without-android"
     ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "cleanup_temp"
+    "cwd": "[SLAVE_BUILD]/src",
+    "env": {
+      "LLVM_FORCE_HEAD_REVISION": "YES"
+    },
+    "name": "checkout llvm"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[DEPOT_TOOLS]/gclient.py",
-      "runhooks"
+      "[DEPOT_TOOLS]/gn.py",
+      "--root=[SLAVE_BUILD]/src",
+      "gen",
+      "//out/Release",
+      "--args=use_libfuzzer=true is_asan=true is_debug=false target_cpu=\"x64\""
     ],
     "cwd": "[SLAVE_BUILD]",
-    "env": {
-      "GYP_CHROMIUM_NO_ACTION": "1",
-      "GYP_DEFINES": "component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
-    },
-    "name": "gclient runhooks"
+    "name": "gn"
   },
   {
     "cmd": [
@@ -93,12 +99,23 @@
       "-u",
       "[DEPOT_TOOLS]/gn.py",
       "--root=[SLAVE_BUILD]/src",
-      "gen",
-      "//out/Release",
-      "--args=is_debug=false target_cpu=\"x64\" use_goma=true goma_dir=\"[BUILD]/goma\""
+      "refs",
+      "[SLAVE_BUILD]/src/out/Release",
+      "--all",
+      "--type=executable",
+      "--args=\"use_libfuzzer=true is_asan=true\"",
+      "--as=output",
+      "//webrtc/test/fuzzers:webrtc_fuzzer_main"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "gn"
+    "name": "calculate targets",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@targets@target1@@@",
+      "@@@STEP_LOG_LINE@targets@target2@@@",
+      "@@@STEP_LOG_LINE@targets@target3@@@",
+      "@@@STEP_LOG_END@targets@@@"
+    ]
   },
   {
     "cmd": [
@@ -120,7 +137,9 @@
       "--goma-fail-fast",
       "--goma-disable-local-fallback",
       "--",
-      "all"
+      "target1",
+      "target2",
+      "target3"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compile",