[Android] Generate scripts at build time to run android tests.

content/shell/android/BUILD.gn

Index: content/shell/android/BUILD.gn
diff --git a/content/shell/android/BUILD.gn b/content/shell/android/BUILD.gn
index 96a8872757803897df05a5139924302d1ceb739c..73769415fb469301b0da2f711c44ffd654a3d07e 100644
--- a/content/shell/android/BUILD.gn
+++ b/content/shell/android/BUILD.gn
@@ -147,21 +147,19 @@ android_library("content_shell_test_java") {
   DEPRECATED_java_in_dir = "javatests/src"
 }
 
-android_apk("content_shell_test_apk") {
-  testonly = true
+instrumentation_test_apk("content_shell_test_apk") {
   deps = [
     "//content/public/android:content_javatests",
     "//base:base_javatests",
     "//net/android:net_javatests",
-    "//testing/android/broker:broker_java",
   ]
   datadeps = [
     ":content_shell_apk",
-    "//testing/android/driver:driver_apk",
   ]
   apk_under_test = ":content_shell_apk"
   apk_name = "ContentShellTest"
   android_manifest = "javatests/AndroidManifest.xml"
+  isolate_file = "../../content_shell_test_apk.isolate"
 }
 
 if (current_cpu != "x64" && current_cpu != "arm64") {