Revert "Remove ANGLE recipe config."

This reverts commit b8686d26.

Reason for revert: Breaks presubmit bot.
https://ci.chromium.org/ui/p/angle/builders/try/presubmit/20928/overview

Original change's description:
> Remove ANGLE recipe config.
>
> This config is now located in the ANGLE recipe_module.
>
> Bug: angleproject:5114
> Change-Id: I2c4cc51dafeb94378056c135538d0d13bac9c8cb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2826242
> Auto-Submit: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
> Reviewed-by: Andrii Shyshkalov <tandrii@google.com>

Bug: angleproject:5114
Change-Id: Ifcf762d5a9e2c57a2ac5963b765042534bc9769f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2830370
Auto-Submit: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>

recipes/README.recipes.md

@@ -1008,7 +1008,7 @@ 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#53)(api):**
+— **def [RunSteps](/recipes/recipe_modules/gclient/examples/full.py#54)(api):**
 ### *recipes* / [gclient:tests/diff\_deps](/recipes/recipe_modules/gclient/tests/diff_deps.py)
 
 [DEPS](/recipes/recipe_modules/gclient/tests/diff_deps.py#7): [gclient](#recipe_modules-gclient), [recipe\_engine/assertions][recipe_engine/recipe_modules/assertions], [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/raw\_io][recipe_engine/recipe_modules/raw_io]

recipes/recipe_modules/gclient/config.py

@@ -405,6 +405,19 @@ def gerrit_test_cq_normal(c):
   soln.name = 'gerrit-test-cq-normal'
   soln.url = 'https://chromium.googlesource.com/playground/gerrit-cq/normal.git'
 
+@config_ctx()
+def angle(c):
+  soln = c.solutions.add()
+  soln.name = 'angle'
+  soln.url = 'https://chromium.googlesource.com/angle/angle.git'
+  # Standalone developer angle builds want the angle checkout in the same
+  # directory the .gclient file is in.  Bots want it in a directory called
+  # 'angle'.  To make both cases work, the angle DEPS file pulls deps and runs
+  # hooks relative to the variable "root" which is set to . by default and
+  # then to 'angle' in the recipes here:
+  soln.custom_vars = {'angle_root': 'angle'}
+  c.got_revision_mapping['angle'] = 'got_revision'
+
 @config_ctx()
 def dawn(c):
   soln = c.solutions.add()

recipes/recipe_modules/gclient/examples/full.py

@@ -14,6 +14,7 @@ DEPS = [
 
 TEST_CONFIGS = [
   'android',
+  'angle',
   'boringssl',
   'build_internal',
   'build_internal_scripts_slave',