Filip Filmar 400e3b00fb Wires the locale provided by Fuchsia. (#13045)
The FIDL service `fuchsia.intl.PropertyProvider` is a service that
the flutter runner can use to obtain information on system preferred
locales.

This change sends a platform message "setLocale" on the channel
"flutter/localization", based on the values provided by the above
mentioned FIDL service.

Credit: most of this was initially written by @kpozin; I ported it
to out-of-tree flutter engine.

Tested:

1. Compile and publish the unit tests package as shown in
   the script below.
2. In a Fuchsia repository (pointed to by `$FUCHSIA_DIR`), run
   `fx serve`
3. `fx shell run fuchsia-pkg://fuchsia.com/flutter_runner_tests#meta/flutter_runner_tests.cmx`

The script used to update the unit tests.

```bash

set -x

FLUTTER_ENGINE_DIR="${FLUTTER_ENGINE_DIR:-$HOME/fx/flutter/engine/src}"
readonly OUT_DIR="${FLUTTER_ENGINE_DIR}/out"

(
  cd ${FLUTTER_ENGINE_DIR}
  ./flutter/tools/gn --fuchsia --fuchsia-cpu x64 --unoptimized
  ninja -j 100 -C "${OUT_DIR}/fuchsia_debug_unopt_x64"
  cp "${OUT_DIR}/compile_commands.json" "${FLUTTER_ENGINE_DIR}"

  echo "Publishing the tests package"
  "${FLUTTER_ENGINE_DIR}/fuchsia/sdk/linux/tools/pm" publish \
    -a -r $FUCHSIA_DIR/out/release/amber-files \
    -f "${FLUTTER_ENGINE_DIR}/out/fuchsia_debug_unopt_x64/flutter_runner_tests-0.far"
)
```
2019-10-23 15:05:19 -07:00

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C++

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FLUTTER_SHELL_PLATFORM_FUCHSIA_FUCHSIA_INTL_H_
#define FLUTTER_SHELL_PLATFORM_FUCHSIA_FUCHSIA_INTL_H_
#include <fuchsia/intl/cpp/fidl.h>
namespace flutter_runner {
// Make a byte vector containing the JSON string used for a localization
// PlatformMessage, using the locale list in the given Profile.
//
// This method does not return a `fml::RefPtr<flutter::PlatformMessage>` for
// testing convenience; that would require an unreasonably large set of
// dependencies for the unit tests.
std::vector<uint8_t> MakeLocalizationPlatformMessageData(
const fuchsia::intl::Profile& intl_profile);
} // namespace flutter_runner
#endif // FLUTTER_SHELL_PLATFORM_FUCHSIA_FUCHSIA_INTL_H_