Add icu_assets GN rule

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("//third_party/icu/config.gni")
 
+if (is_android) {
+  import("//build/config/android/rules.gni")
+}
+
 # Meta target that includes both icuuc and icui18n. Most targets want both.
 # You can depend on the individually if you need to.
 group("icu") {
   public_deps = [
     ":icui18n",
     ":icuuc",
   ]
 }
 
 # Shared config used by ICU and all dependents.
@@ skipping 497 matching lines @@
   configs += [ ":icu_code" ]
 
   public_configs = [ ":icu_config" ]
 
   if (is_win || icu_use_data_file) {
     sources += [ "source/stubdata/stubdata.c" ]
     defines += [ "U_ICUDATAENTRY_IN_COMMON" ]
   }
 }
 
+if (is_android) {
+  android_assets("icu_assets") {
+    if (icu_use_data_file) {
+      sources = [ "$root_out_dir/icudtl.dat" ]
+      deps = [ ":icudata" ]
+      disable_compression = true
+    }
+  }
+}
+
 # TODO(GYP) support use_system_icu.
 if (icu_use_data_file) {
   if (is_ios) {
     group("icudata") {
       # TODO(GYP): Provide an empty group so that this target does not
       # unconditionally fail. The dat file needs to be bundled separately. In
       # the longer term, need to figure out how to use system ICU
     }
   } else {
     copy("icudata") {
@@ skipping 49 matching lines @@
         sources = [
           "android/icudtl_dat.S",
         ]
       } else {
         assert(false, "No icu data for this platform")
       }
       defines = [ "U_HIDE_DATA_SYMBOL" ]
     }
   }
 }