[vm] Replaces fuchsia.deprecatedtimezone

(prior attempt was rolled back as it had a regression which was not
caught by tests.  Tests are fixed now at:
https://fuchsia-review.googlesource.com/c/fuchsia/+/409840)

The FIDL library fuchsia.deprecatedtimezone is going away.  There are
different and better ways to obtain the same functionality.  This change
removes the dependency on fuchsia.deprecatedtimezone from the Dart SDK.

Adds inspect metrics that allow whitebox testing of the runners.  Here's
a sample `fx iquery` excerpt from a running device, showing both a dart
and a flutter runner exposing the same OS diagnostic metrics.

Adds support for asynchronous timezone updates, which was missing from
previous versions of this commit.

```
/hub/c/dart_jit_runner.cmx/70981/out/diagnostics:
  /hub/c/dart_jit_runner.cmx/70981/out/diagnostics#os:
    dst_status = 0
    get_profile_status = 0
    timezone_content_status = 0
    tz_data_close_status = 0
    tz_data_status = 0
/hub/c/flutter_jit_runner.cmx/29567/out/diagnostics:
  /hub/c/flutter_jit_runner.cmx/29567/out/diagnostics#os:
    dst_status = 0
    get_profile_status = 0
    timezone_content_status = 0
    tz_data_close_status = 0
    tz_data_status = 0
```

Under nominal operation, all of the above values should be equal to 0.
Nonzero values indicate an error.

This functionality is guarded by Fuchsia integration tests at
//src/tests/intl.


Tested:
  (compile locally for Fuchsia and deploy)
  fx test //src/tests/intl

See:
  - dart-lang/sdk#42245
  - dart-lang/sdk#39650

Fixes #39650
TEST=see Tested: above
Change-Id: Icb72ddd554c263f970e18b9cbbaab7adf43c8710
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155582
Auto-Submit: Filip Filmar <[email protected]>
Reviewed-by: Martin Kustermann <[email protected]>
Commit-Queue: Martin Kustermann <[email protected]>

Author: filmil

runtime/vm/BUILD.gn

@@ -74,7 +74,7 @@ library_for_all_configs("libdart_vm") {
   if (is_fuchsia) {
     if (using_fuchsia_gn_sdk) {
       extra_deps = [
-        "$fuchsia_sdk_root/fidl/fuchsia.deprecatedtimezone",
+        "$fuchsia_sdk_root/fidl/fuchsia.intl",
         "$fuchsia_sdk_root/pkg/async",
         "$fuchsia_sdk_root/pkg/async-default",
         "$fuchsia_sdk_root/pkg/async-loop",
@@ -87,7 +87,7 @@ library_for_all_configs("libdart_vm") {
       ]
     } else if (using_fuchsia_sdk) {
       extra_deps = [
-        "$fuchsia_sdk_root/fidl:fuchsia.deprecatedtimezone",
+        "$fuchsia_sdk_root/fidl:fuchsia.intl",
         "$fuchsia_sdk_root/pkg:async-loop",
         "$fuchsia_sdk_root/pkg:async-loop-default",
         "$fuchsia_sdk_root/pkg:inspect",
@@ -98,9 +98,7 @@ library_for_all_configs("libdart_vm") {
       ]
     } else {
       extra_deps = [
-        # TODO(US-399): Remove time_service specific code when it is no longer
-        # necessary.
-        "//sdk/fidl/fuchsia.deprecatedtimezone",
+        "//sdk/fidl/fuchsia.intl",
         "//sdk/lib/sys/cpp",
         "//sdk/lib/sys/inspect/cpp",
         "//zircon/public/lib/fbl",