[ci] Add experimental branch experimental/agp-gradle-api to enabled_branches and customer_testing

.ci.yaml

diff --git a/.ci.yaml b/.ci.yaml
index d8f3a73..fce2f88 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -14,6 +14,7 @@
 enabled_branches:
   - master
   - flutter-\d+\.\d+-candidate\.\d+
+  - experimental/agp-gradle-api
 
 platform_properties:
   staging_build_linux:
@@ -560,6 +561,7 @@
     # calling the dev/bots/test.dart script.
     enabled_branches:
       - master
+      - experimental/agp-gradle-api
     recipe: flutter/flutter_drone
     # Timeout in minutes for the whole task.
     timeout: 60
@@ -4165,6 +4167,7 @@
   - name: Mac customer_testing
     enabled_branches:
       - master
+      - experimental/agp-gradle-api
     recipe: flutter/flutter_drone
     # Timeout in minutes for the whole task.
     timeout: 60
@@ -6312,6 +6315,7 @@
   - name: Windows customer_testing
     enabled_branches:
       - master
+      - experimental/agp-gradle-api
     recipe: flutter/flutter_drone
     # Timeout in minutes for the whole task.
     timeout: 60

engine/src/flutter/.ci.yaml

diff --git a/engine/src/flutter/.ci.yaml b/engine/src/flutter/.ci.yaml
index f33e21a..05e3527 100644
--- a/engine/src/flutter/.ci.yaml
+++ b/engine/src/flutter/.ci.yaml
@@ -9,6 +9,7 @@
   - master
   - flutter-\d+\.\d+-candidate\.\d+
   - fuchsia_f\d+[a-z]*
+  - experimental/agp-gradle-api
 
 platform_properties:
   linux: