Add gn support for generating mojo_shell_apk

mojo/shell/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//mojo/public/mojo.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
+if (is_android) {
+  import("//build/config/android/config.gni")
+  import("//build/config/android/rules.gni")
+}
+
 if (!use_prebuilt_mojo_shell) {
 
 # GYP version: mojo/mojo.gyp:mojo_shell
 executable("mojo_shell") {
   deps = [
     ":lib",
     "//base",
     "//mojo/common",
     "//mojo/environment:chromium",
   ]
@@ skipping 72 matching lines @@
       "//mojo/services/native_viewport:lib",
       "//mojo/services/network:lib",
     ]
     sources += [
       "network_application_loader.cc",
       "network_application_loader.h",
     ]
   }
 }
 
+if (is_android) {
+  generate_jni("jni_headers") {
+    sources = [
+      "android/apk/src/org/chromium/mojo_shell_apk/MojoMain.java",
+    ]
+    jni_package = "mojo"
+  }
+
+  android_library("java") {
+    deps = [
+      "//base:base_java",
+      "//net/android:net_java",
+    ]
+    java_files = [
+      "android/apk/src/org/chromium/mojo_shell_apk/MojoMain.java",
+      "android/apk/src/org/chromium/mojo_shell_apk/MojoShellActivity.java",
+      "android/apk/src/org/chromium/mojo_shell_apk/MojoShellApplication.java",
+    ]
+  }
+
+  android_resources("resources") {
+    resource_dirs = [ "android/apk/res" ]
+    custom_package = "org.chromium.mojo_shell_apk"
+  }
+
+  shared_library("libmojo_shell") {
+    deps = [
+      ":jni_headers",
+      ":lib",
+      "//ui/gl",
+    ]
+
+    sources = [
+      "android/library_loader.cc",
+      "android/mojo_main.cc",
+      "android/mojo_main.h",
+    ]
+  }
+
+  android_apk("mojo_shell_apk") {
+    deps = [
+      ":java",
+      ":libmojo_shell",
+      ":resources",
+      "//mojo/services/native_viewport:native_viewport_java",
+    ]
+
+    native_libs = [
+      "libmojo_shell.so"
+    ]
+
+    apk_name = "MojoShell"
+    android_manifest = "android/apk/AndroidManifest.xml"
+  }
+}
+
 mojom("app_child_process_bindings") {
   sources = [
     "app_child_process.mojom"
   ]
 }
 
 mojom("external_service_bindings") {
   sources = [
     "external_service.mojom"
   ]
@@ skipping 88 matching lines @@
     "//mojo/edk/system",
     "//mojo/environment:chromium",
   ]
 
   sources = [
     "incoming_connection_listener_unittest.cc",
     "external_application_listener_unittest.cc",
     "external_application_test_main.cc",
   ]
 }