Add content_shell_apk target (and a bunch of its dependencies)

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 3f04f63b4ab70154a9e8eca0f435f6260371a6a6..7cabdedf84931f566d0cb1ce93308b08f7a55ce6 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1417,6 +1417,13 @@ if (is_android) {
     ]
   }
 
+  android_library("base_java_test_support") {
+    deps = [
+      ":base_java",
+    ]
+    DEPRECATED_java_in_dir = "test/android/javatests/src"
+  }
+
   java_cpp_template("base_java_application_state") {
     sources = [
       "android/java/src/org/chromium/base/ApplicationState.template",