Use a python script to configure unit tests and app tests to run.

mojo/tools/data/unittests

 # This file contains a list of Mojo gtest unit tests.
-# This must be a valid python dictionary.
+# This must be valid python. It can use the |config| global that will be a
+# mopy.config.Config object and must set a |tests| global that will contain the
+# tests to run.
 # TODO(vtl): Add a way of specifying data dependencies instead of cacheable.
-[
+
+tests = [
   # System tests:
   {
     "test": "mojo_system_unittests",
   },
 
   # Public tests:
   {
     "test": "mojo_public_bindings_unittests",
     "cacheable": False,
   },
@@ skipping 23 matching lines @@
   {
     "test": "mojo_surfaces_lib_unittests",
   },
   {
     "test": "view_manager_service_unittests",
   },
   {
     "test": "window_manager_unittests",
   },
 
-  # Tests for components we depend on:
-  {
-    "test": "gfx_unittests",
-    "target_os": ["!android"],
-  },
-  {
-    "test": "events_unittests",
-    "target_os": ["!android"],
-  },
-
-  # JavaScript tests:
-  {
-    "test": "js_unittests",
-    "cacheable": False,
-    "target_os": ["!android"],
-  },
-  {
-    "test": "js_integration_tests",
-    "cacheable": False,
-    "target_os": ["!android"],
-  },
-  {
-    "test": "js_services_unittests",
-    "cacheable": False,
-    "target_os": ["!android"],
-  },
-
   # Shell integration tests:
   {
     "test": "mojo_shell_tests",
     "cacheable": False,
   },
 ]
+
+if config.target_os != config.OS_ANDROID:
+  tests += [
+    # Tests for components we depend on:
+    {
+      "test": "gfx_unittests",
+    },
+    {
+      "test": "events_unittests",
+    },
+
+    # JavaScript tests:
+    {
+      "test": "js_unittests",
+      "cacheable": False,
+    },
+    {
+      "test": "js_integration_tests",
+      "cacheable": False,
+    },
+    {
+      "test": "js_services_unittests",
+      "cacheable": False,
+    },
+  ]