Add android_library template

build/config/android/config.gni

 # 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.
 
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
   declare_args() {
     # Absolute directory containing the Android source code.
     android_src = ""
 
+    android_sdk_root = "//third_party/android_tools/sdk"
+    android_sdk_version = "19"
+
     # This is set when building the Android WebView inside the Android build
     # system, using the 'android' gyp backend. The WebView code is still built
     # when this is unset, but builds using the normal chromium build system.
     is_android_webview_build = false
   }
 
   if (is_android_webview_build) {
     assert(android_src != "",
            "You must specify android_src for an Android WebView build.")
   }
 
+
+  android_sdk = "${android_sdk_root}/platforms/android-${android_sdk_version}"
+
   # android_ndk_root -----------------------------------------------------------
 
   # Full system path to the Android NDK.
   android_ndk_root = rebase_path("//third_party/android_tools/ndk")
 
   # stlport stuff --------------------------------------------------------------
 
   use_system_stlport = is_android_webview_build
 
   if (use_system_stlport) {
@@ skipping 19 matching lines @@
     android_app_abi = "mips"
   } else {
     assert(false, "Unknown Android ABI: " + cpu_arch)
   }
 } else {
   if (!defined(is_android_webview_build)) {
     is_android_webview_build = false
   }
   use_system_stlport = false
 }