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

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index 61b08674a71a92ad76b8c962189a883db89e7e9b..e164a78010ce6be5a9385e0964a509259dd518cd 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -300,6 +300,11 @@ test("components_unittests") {
     "//ui/base",
     "//ui/resources:ui_test_pak",
   ]
+
+  if (is_android) {
+    isolate_file = "components_unittests.isolate"
+  }
+
   data_deps = [ ":components_tests_pak" ]
 
   if (!is_android && !is_ios) {
@@ -384,8 +389,8 @@ test("components_browsertests") {
     ]
     sources -= [ "autofill/content/browser/risk/fingerprint_browsertest.cc" ]
     deps += [ "//testing/android/native_test:native_test_support" ]
-
     use_launcher = false
+    isolate_file = "components_browsertests.isolate"
   }
 
   if (is_linux) {