Add support for compression filters in the mojo dart:io

mojo/dart/embedder/BUILD.gn

Index: mojo/dart/embedder/BUILD.gn
diff --git a/mojo/dart/embedder/BUILD.gn b/mojo/dart/embedder/BUILD.gn
index d47a349b1e7bdfc46ab350961840e5afed17186e..97f848d35f1a9177c453754309affb470f88847b 100644
--- a/mojo/dart/embedder/BUILD.gn
+++ b/mojo/dart/embedder/BUILD.gn
@@ -26,6 +26,8 @@ source_set("dart_controller_no_snapshot") {
     "common.h",
     "dart_controller.cc",
     "dart_controller.h",
+    "io/filter.cc",
+    "io/filter.h",
     "io/internet_address.h",
     "io/internet_address_posix.cc",
     "mojo_dart_state.h",
@@ -51,6 +53,7 @@ source_set("dart_controller_no_snapshot") {
     "//mojo/public/platform/dart:mojo_internal_impl",
     "//mojo/services/files/interfaces",
     "//mojo/services/network/interfaces",
+    "//third_party/zlib",
     "//tonic",
   ]
 
@@ -66,6 +69,7 @@ dart_embedder_resources("generate_dart_embedder_patch_resources_cc") {
   inputs = [
     "//mojo/dart/embedder/core/natives_patch.dart",
     "//mojo/dart/embedder/io/file_patch.dart",
+    "//mojo/dart/embedder/io/filter_patch.dart",
     "//mojo/dart/embedder/io/internet_address_patch.dart",
     "//mojo/dart/embedder/io/mojo_patch.dart",
     "//mojo/dart/embedder/io/platform_patch.dart",