Add gn support for generating mojo_shell_apk

mojo/services/native_viewport/BUILD.gn

Index: mojo/services/native_viewport/BUILD.gn
diff --git a/mojo/services/native_viewport/BUILD.gn b/mojo/services/native_viewport/BUILD.gn
index ed428c459535aa829aea0d1ffcf98b1d02dd417c..486fab11a32105361f983ee4d5a96655390d0f8b 100644
--- a/mojo/services/native_viewport/BUILD.gn
+++ b/mojo/services/native_viewport/BUILD.gn
@@ -4,7 +4,17 @@
 
 import("//build/config/ui.gni")
 
-if (!is_android) {
+if (is_android) {
+  import("//build/config/android/config.gni")
+  import("//build/config/android/rules.gni")
+
+  android_library("native_viewport_java") {
+    deps = [
+      "//base:base_java",
+    ]
+    DEPRECATED_java_in_dir = "android/src"

[jamesr, 2014/10/23 23:35:50]

can you use the non-DEPRECATED version? i believe that means listing out the
source files

[DaveMoore, 2014/10/24 02:25:48]

Done. I didn't realize there was a new version. It looks like most targets use
the deprecated one.

+  }
+} else {
   shared_library("native_viewport") {
     output_name = "native_viewport_service"