Revert "Roll Dart to 1f4dfce (flutter#6515)" (flutter#6537)

This reverts commit ba04499.

DEPS

@@ -31,7 +31,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '1f4dfce179c8f05c9e48759300a15e671b88cc10',
+  'dart_revision': 'b99bcfd3099f0d32e39287160a9539e878cb0b68',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -126,7 +126,7 @@ deps = {
    # and not have to specific specific hashes.
 
   'src/third_party/tonic':
-   Var('fuchsia_git') + '/tonic' + '@' + 'dd971f40ba7646fab586ac2b6370721257109cb7',
+   Var('fuchsia_git') + '/tonic' + '@' + '187c6d54eb7ac604e6ae00577d8992ffdc34e52c',
 
   'src/third_party/benchmark':
    Var('fuchsia_git') + '/third_party/benchmark' + '@' + '21f1eb3fe269ea43eba862bf6b699cde46587ade',

runtime/BUILD.gn

@@ -6,6 +6,41 @@ import("//third_party/dart/runtime/bin/vmservice/vmservice_sources.gni")
 import("$flutter_root/common/config.gni")
 import("$flutter_root/testing/testing.gni")
 
+action("gen_embedded_resources_cc") {
+  script = "//third_party/dart/runtime/tools/create_resources.py"
+  output_file = "$target_gen_dir/embedded_resources.cc"
+  outputs = [
+    output_file,
+  ]
+
+  inputs = rebase_path(vmservice_sources,
+                       "",
+                       "//third_party/dart/runtime/bin/vmservice")
+
+  args = [
+           "--output",
+           rebase_path(output_file),
+           "--outer_namespace",
+           "flutter",
+           "--inner_namespace",
+           "runtime",
+           "--table_name",
+           "flutter_embedded_service_isolate",
+           "--root_prefix",
+           rebase_path("//third_party/dart/runtime/bin/"),
+         ] + rebase_path(inputs)
+}
+
+source_set("embedded_resources_cc") {
+  sources = [
+    "$target_gen_dir/embedded_resources.cc",
+  ]
+  deps = [
+    ":gen_embedded_resources_cc",
+  ]
+  public_configs = [ "$flutter_root:config" ]
+}
+
 source_set("test_font") {
   sources = [
     "test_font_data.cc",
@@ -49,6 +84,7 @@ source_set("runtime") {
   ]
 
   deps = [
+    ":embedded_resources_cc",
     ":test_font",
     "$flutter_root/assets",
     "$flutter_root/common",