Add standalone tint gclient config

BUG=tint:1

Change-Id: Ie24a17c0d52ade62a4f2eb02d513f33011615113
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2219573
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>

recipes/README.recipes.md

@@ -954,7 +954,7 @@ Raises:
 
 [DEPS](/recipes/recipe_modules/gclient/examples/full.py#5): [gclient](#recipe_modules-gclient), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/step][recipe_engine/recipe_modules/step]
 
-— **def [RunSteps](/recipes/recipe_modules/gclient/examples/full.py#54)(api):**
+— **def [RunSteps](/recipes/recipe_modules/gclient/examples/full.py#55)(api):**
 ### *recipes* / [gclient:tests/patch\_project](/recipes/recipe_modules/gclient/tests/patch_project.py)
 
 [DEPS](/recipes/recipe_modules/gclient/tests/patch_project.py#9): [gclient](#recipe_modules-gclient), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/properties][recipe_engine/recipe_modules/properties]

recipes/recipe_modules/gclient/config.py

@@ -453,3 +453,10 @@ def devtools(c):
       'https://chromium.googlesource.com/devtools/devtools-frontend': (
           'devtools/devtools-frontend', 'HEAD'),
   })
+
+@config_ctx()
+def tint(c):
+  soln = c.solutions.add()
+  soln.name = 'tint'
+  soln.url = 'https://dawn.googlesource.com/tint.git'
+  c.got_revision_mapping['tint'] = 'got_revision'

recipes/recipe_modules/gclient/examples/full.py

@@ -44,6 +44,7 @@ TEST_CONFIGS = [
   'recipes_py',
   'recipes_py_bare',
   'slave_deps',
+  'tint',
   'wasm_llvm',
   'webports',
   'with_branch_heads',