Add explicit dependency between proto and AGP tasks

Test: treehugger
Change-Id: I086054a50ebfddd2194d88b1fac902693a328e79
diff --git a/build.gradle b/build.gradle
index 437f57f..882a929 100644
--- a/build.gradle
+++ b/build.gradle
@@ -69,6 +69,9 @@
 
     generateProtoTasks {
         all().each { task ->
+            project.tasks.named("extractReleaseAnnotations").configure {
+                it.dependsOn(task)
+            }
             task.builtins {
                 java {
                     option 'lite'