Fix most fml tests on Fuchsia (#14007)

* Add fuchsia MessageLoopImpl; fix several tests

ci/licenses_golden/licenses_flutter

@@ -170,6 +170,8 @@ FILE: ../../../flutter/fml/platform/darwin/scoped_nsobject.mm
 FILE: ../../../flutter/fml/platform/darwin/string_range_sanitization.h
 FILE: ../../../flutter/fml/platform/darwin/string_range_sanitization.mm
 FILE: ../../../flutter/fml/platform/darwin/string_range_sanitization_unittests.mm
+FILE: ../../../flutter/fml/platform/fuchsia/message_loop_fuchsia.cc
+FILE: ../../../flutter/fml/platform/fuchsia/message_loop_fuchsia.h
 FILE: ../../../flutter/fml/platform/fuchsia/paths_fuchsia.cc
 FILE: ../../../flutter/fml/platform/linux/message_loop_linux.cc
 FILE: ../../../flutter/fml/platform/linux/message_loop_linux.h

fml/BUILD.gn

@@ -164,12 +164,28 @@ source_set("fml") {
   }
 
   if (is_fuchsia) {
-    sources += [ "platform/fuchsia/paths_fuchsia.cc" ]
+    sources += [
+      "platform/fuchsia/message_loop_fuchsia.cc",
+      "platform/fuchsia/message_loop_fuchsia.h",
+      "platform/fuchsia/paths_fuchsia.cc",
+    ]
 
     if (using_fuchsia_sdk) {
-      public_deps += [ "$fuchsia_sdk_root/pkg:trace" ]
+      public_deps += [
+        "$fuchsia_sdk_root/pkg:async-cpp",
+        "$fuchsia_sdk_root/pkg:async-loop-cpp",
+        "$fuchsia_sdk_root/pkg:async-loop-default",
+        "$fuchsia_sdk_root/pkg:trace",
+        "$fuchsia_sdk_root/pkg:zx",
+      ]
     } else {
-      public_deps += [ "//zircon/public/lib/trace" ]
+      public_deps += [
+        "//zircon/public/lib/async-cpp",
+        "//zircon/public/lib/async-loop-cpp",
+        "//zircon/public/lib/async-loop-default",
+        "//zircon/public/lib/trace",
+        "//zircon/public/lib/zx",
+      ]
     }
   }
 
@@ -205,16 +221,21 @@ executable("fml_unittests") {
   sources = [
     "base32_unittest.cc",
     "command_line_unittest.cc",
+    "gpu_thread_merger_unittests.cc",
     "memory/ref_counted_unittest.cc",
     "memory/weak_ptr_unittest.cc",
     "message_loop_task_queues_merge_unmerge_unittests.cc",
+    "message_loop_task_queues_unittests.cc",
+    "message_loop_unittests.cc",
     "message_unittests.cc",
     "paths_unittests.cc",
     "platform/darwin/string_range_sanitization_unittests.mm",
+    "synchronization/count_down_latch_unittests.cc",
     "synchronization/semaphore_unittest.cc",
     "synchronization/sync_switch_unittest.cc",
     "synchronization/waitable_event_unittest.cc",
     "thread_local_unittests.cc",
+    "thread_unittests.cc",
     "time/time_delta_unittest.cc",
     "time/time_point_unittest.cc",
     "time/time_unittest.cc",
@@ -222,14 +243,7 @@ executable("fml_unittests") {
 
   # TODO(gw280): Figure out why these tests don't work currently on Fuchsia
   if (!is_fuchsia) {
-    sources += [
-      "file_unittest.cc",
-      "gpu_thread_merger_unittests.cc",
-      "message_loop_task_queues_unittests.cc",
-      "message_loop_unittests.cc",
-      "synchronization/count_down_latch_unittests.cc",
-      "thread_unittests.cc",
-    ]
+    sources += [ "file_unittest.cc" ]
   }
 
   deps = [

fml/message_loop_impl.cc

@@ -17,6 +17,8 @@
 #include "flutter/fml/platform/darwin/message_loop_darwin.h"
 #elif OS_ANDROID
 #include "flutter/fml/platform/android/message_loop_android.h"
+#elif OS_FUCHSIA
+#include "flutter/fml/platform/fuchsia/message_loop_fuchsia.h"
 #elif OS_LINUX
 #include "flutter/fml/platform/linux/message_loop_linux.h"
 #elif OS_WIN
@@ -30,6 +32,8 @@ fml::RefPtr<MessageLoopImpl> MessageLoopImpl::Create() {
   return fml::MakeRefCounted<MessageLoopDarwin>();
 #elif OS_ANDROID
   return fml::MakeRefCounted<MessageLoopAndroid>();
+#elif OS_FUCHSIA
+  return fml::MakeRefCounted<MessageLoopFuchsia>();
 #elif OS_LINUX
   return fml::MakeRefCounted<MessageLoopLinux>();
 #elif OS_WIN

fml/platform/fuchsia/message_loop_fuchsia.cc

@@ -0,0 +1,38 @@
+// 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.
+
+#include "flutter/fml/platform/fuchsia/message_loop_fuchsia.h"
+
+#include <lib/async-loop/default.h>
+#include <lib/async/cpp/task.h>
+#include <lib/zx/time.h>
+
+namespace fml {
+
+MessageLoopFuchsia::MessageLoopFuchsia()
+    : loop_(&kAsyncLoopConfigAttachToCurrentThread) {}
+
+MessageLoopFuchsia::~MessageLoopFuchsia() = default;
+
+void MessageLoopFuchsia::Run() {
+  loop_.Run();
+}
+
+void MessageLoopFuchsia::Terminate() {
+  loop_.Quit();
+}
+
+void MessageLoopFuchsia::WakeUp(fml::TimePoint time_point) {
+  fml::TimePoint now = fml::TimePoint::Now();
+  zx::duration due_time{0};
+  if (time_point > now) {
+    due_time = zx::nsec((time_point - now).ToNanoseconds());
+  }
+
+  FML_DCHECK(async::PostDelayedTask(
+                 loop_.dispatcher(), [this]() { RunExpiredTasksNow(); },
+                 due_time) == ZX_OK);
+}
+
+}  // namespace fml

fml/platform/fuchsia/message_loop_fuchsia.h

@@ -0,0 +1,36 @@
+// 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_FML_PLATFORM_FUCHSIA_MESSAGE_LOOP_FUCHSIA_H_
+#define FLUTTER_FML_PLATFORM_FUCHSIA_MESSAGE_LOOP_FUCHSIA_H_
+
+#include <lib/async-loop/cpp/loop.h>
+
+#include "flutter/fml/macros.h"
+#include "flutter/fml/message_loop_impl.h"
+
+namespace fml {
+
+class MessageLoopFuchsia : public MessageLoopImpl {
+ private:
+  MessageLoopFuchsia();
+
+  ~MessageLoopFuchsia() override;
+
+  void Run() override;
+
+  void Terminate() override;
+
+  void WakeUp(fml::TimePoint time_point) override;
+
+  async::Loop loop_;
+
+  FML_FRIEND_MAKE_REF_COUNTED(MessageLoopFuchsia);
+  FML_FRIEND_REF_COUNTED_THREAD_SAFE(MessageLoopFuchsia);
+  FML_DISALLOW_COPY_AND_ASSIGN(MessageLoopFuchsia);
+};
+
+}  // namespace fml
+
+#endif  // FLUTTER_FML_PLATFORM_FUCHSIA_MESSAGE_LOOP_FUCHSIA_H_

shell/platform/fuchsia/flutter/meta/flutter_runner_tests.cmx

@@ -10,7 +10,7 @@
     "services": [
       "fuchsia.accessibility.semantics.SemanticsManager",
       "fuchsia.intl.PropertyProvider",
-      "fuchsia.sys.Launcher"
+      "fuchsia.process.Launcher"
     ]
   }
 }

testing/fuchsia/meta/fuchsia_test.cmx

@@ -9,7 +9,7 @@
     ],
     "services": [
       "fuchsia.accessibility.semantics.SemanticsManager",
-      "fuchsia.sys.Launcher"
+      "fuchsia.process.Launcher"
     ]
   }
 }