Migrate Android NDK to CIPD [1/2]

The Android NDK dependency is moving to a CIPD bucket to reduce the
checkout cost and to eventually move to NDK v25. This introduces the
NDK into an 'android_toolchain' directory. Following the roll of
chromium/base in this repository, a second change will delete the old
'android_ndk' checkout. As a result, the checkout size of this
repository will temporarily increase.

Bug: 1448383
Test: Verified local builds of LibYUV.
Change-Id: I35a933e2d7853b12e155c5d2b727cd4b1c5474e5
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4583617
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
diff --git a/DEPS b/DEPS
index 1b42d71..22db678 100644
--- a/DEPS
+++ b/DEPS
@@ -186,6 +186,16 @@
     'url': Var('chromium_git') + '/android_ndk.git' + '@' + '310956bd122ec2b96049f8d7398de6b717f3452e',
     'condition': 'checkout_android',
   },
+  'src/third_party/android_toolchain': {
+      'packages': [
+            {
+                'package': 'chromium/third_party/android_toolchain/r23c/android_toolchain',
+                'version': 'version:2@r23c.cr0',
+            },
+      ],
+      'condition': 'checkout_android',
+      'dep_type': 'cipd',
+  },
 
   'src/third_party/androidx': {
     'packages': [