[Android] Set up continuous builder + trybot for cronet.

masters/master.chromium.android/builders.pyl

Index: masters/master.chromium.android/builders.pyl
diff --git a/masters/master.chromium.android/builders.pyl b/masters/master.chromium.android/builders.pyl
index 98dbc604903fdaa5ebd62320c2a79e4acc3de02c..98166b897675342c41e037a777202a67a73320c0 100644
--- a/masters/master.chromium.android/builders.pyl
+++ b/masters/master.chromium.android/builders.pyl
@@ -12,6 +12,13 @@
   "default_remote_run_repository": "https://chromium.googlesource.com/chromium/src.git",
 
   "builders": {
+    "Android Cronet Builder": {
+      "recipe": "chromium",
+      "scheduler": "android_commits",
+      "slave_pools": ["builders"],
+      "slavebuilddir": "cronet",
+      "category": "0Cronet",
+    },
     "Android Cronet KitKat Builder": {
       "recipe": "cronet",
       "scheduler": "android_commits",