Add script to validate installed Android SDK packages

build/secondary/third_party/android_tools/BUILD.gn

Index: build/secondary/third_party/android_tools/BUILD.gn
diff --git a/build/secondary/third_party/android_tools/BUILD.gn b/build/secondary/third_party/android_tools/BUILD.gn
index dc934cb93e40b50637fdfd939f6726d272f02e3e..6f8336ba85d31c8573df670b23223d6a32b21d91 100644
--- a/build/secondary/third_party/android_tools/BUILD.gn
+++ b/build/secondary/third_party/android_tools/BUILD.gn
@@ -89,6 +89,25 @@ android_java_prebuilt("google_play_services_default_java") {
   deps = [
     ":android_support_v13_java",
     ":google_play_services_default_resources",
+    ":check_sdk_extras_version",
   ]
   jar_path = "$android_sdk_root/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar"
 }
+action("check_sdk_extras_version") {
+  script = "//build/check_sdk_extras_version.py"
+  args = [
+    "--package-id",
+    "extra-google-google_play_services",
+    "--package-location",
+    rebase_path("$android_sdk_root/extras/google/google_play_services"),
+    "--stamp",
+    rebase_path("$target_gen_dir/checked_sdk_extras_version.stamp"),
+  ]
+  inputs = [
+    "//build/android_sdk_extras.json",
+    "$android_sdk_root/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar",

[aberent, 2015/06/18 15:36:03]

Strictly, I think, this should depend upon the whole of
"$android_sdk_root/extras/google/google_play_services", if GYP allows directory
dependencies, or on 
"$android_sdk_root/extras/google/google_play_services/source.properties". As it
is at the moment it builds in the current structure of google play services.

[dgn, 2015/06/18 17:20:17]

Good point, thanks.

That being said, I'm having trouble making it build. I run into this error:

Unknown deps:
['gen/third_party/android_tools/check_sdk_extras_version.build_config']

@cjhopman: You added the build_configs related stuff, right? Do you know what
I'm doing wrong here?

+  ]
+  outputs = [
+    "$target_gen_dir/checked_sdk_extras_version.stamp",
+  ]
+}