Support ICU on Android

This CL adds an icu_data application that vends ICU data to clients via shared
memory. We use a sha1hash to validate the integrity of the data. Currently,
this icu_data service is used on Android only. Desktop platforms load the ICU
data table from the file system, as they did before. See the mojo-dev
discussion for more background.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/826093004
diff --git a/services/BUILD.gn b/services/BUILD.gn
index aa1f145..165f907 100644
--- a/services/BUILD.gn
+++ b/services/BUILD.gn
@@ -7,10 +7,11 @@
 group("services") {
   deps = [
     "//services/clipboard",
-    "//services/gles2:lib",
     "//services/fake_surfaces",
+    "//services/gles2:lib",
     "//services/http_server",
     "//services/http_server/public",
+    "//services/icu_data",
     "//services/js",
     "//services/native_viewport",
     "//services/surfaces",