libyuv: Add GN bots for Win,Mac,Linux,Android

scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_win_x64_gn.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--master",
       "tryserver.libyuv",
       "--builder",
-      "win_x64_clang_rel",
+      "win_x64_gn",
       "--slave",
       "slavename",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'custom_vars': {'root_dir': 'src'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/libyuv/libyuv'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{}",
       "--git-cache-dir",
       "[GIT_CACHE]",
@@ skipping 30 matching lines @@
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
-      "GYP_DEFINES": "clang=1 component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]\\goma' target_arch=x64 use_goma=1",
+      "GYP_CHROMIUM_NO_ACTION": "1",
+      "GYP_DEFINES": "clang=1 component=shared_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]\\goma' target_arch=x64 use_goma=1",
       "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "[DEPOT_TOOLS]\\gn.py",
+      "--root=[SLAVE_BUILD]\\src",
+      "gen",
+      "//out/Debug_x64",
+      "--args=is_debug=true target_cpu=\"x64\" use_goma=true goma_dir=\"[BUILD]\\goma\""
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "gn"
+  },
+  {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\clang_revision.py",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--output-json",
       "/path/to/tmp/json"
     ],
@@ skipping 10 matching lines @@
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\tools\\runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\compile.py",
       "--ninja-path",
       "RECIPE_PACKAGE_REPO[depot_tools]\\ninja.exe",
       "--target",
-      "Release_x64",
+      "Debug_x64",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma-clang",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
       "--goma-dir",
       "[BUILD]\\goma",
       "--goma-fail-fast",
       "--goma-disable-local-fallback",
       "--",
-      "All"
+      "all"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compile",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
       "@@@STEP_LOG_END@json.output (invalid)@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\runtest.py",
       "--target",
-      "Release_x64",
+      "Debug_x64",
       "--factory-properties",
-      "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"win_x64_clang_rel\", \"mastername\": \"tryserver.libyuv\", \"patch_url\": \"try_job_svn_patch\", \"recipe\": \"libyuv/libyuv\", \"revision\": \"12345\", \"slavename\": \"slavename\"}",
+      "{\"BUILD_CONFIG\": \"Debug\", \"buildername\": \"win_x64_gn\", \"mastername\": \"tryserver.libyuv\", \"patch_url\": \"try_job_svn_patch\", \"recipe\": \"libyuv/libyuv\", \"revision\": \"12345\", \"slavename\": \"slavename\"}",
       "--build-properties",
-      "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"win_x64_clang_rel\", \"mastername\": \"tryserver.libyuv\", \"patch_url\": \"try_job_svn_patch\", \"recipe\": \"libyuv/libyuv\", \"revision\": \"12345\", \"slavename\": \"slavename\"}",
+      "{\"BUILD_CONFIG\": \"Debug\", \"buildername\": \"win_x64_gn\", \"mastername\": \"tryserver.libyuv\", \"patch_url\": \"try_job_svn_patch\", \"recipe\": \"libyuv/libyuv\", \"revision\": \"12345\", \"slavename\": \"slavename\"}",
       "--step-name=libyuv_unittest",
-      "--builder-name=win_x64_clang_rel",
+      "--builder-name=win_x64_gn",
       "--slave-name=slavename",
       "libyuv_unittest.exe"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "libyuv_unittest"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]