Add dart_entrypoint_argc/argv to the FlutterProjectArgs

shell/platform/embedder/embedder.cc

@@ -1126,6 +1126,14 @@ FlutterEngineResult FlutterEngineInitialize(size_t version,
     }
   }
 
+  if (SAFE_ACCESS(args, dart_entrypoint_argc, 0)) {
+    std::vector<std::string> arguments(args->dart_entrypoint_argc);
+    for (int i = 0; i < args->dart_entrypoint_argc; ++i) {
+      arguments[i] = std::string{args->dart_entrypoint_argv[i]};
+    }
+    settings.dart_entrypoint_args = std::move(arguments);
+  }
+
   if (!run_configuration.IsValid()) {
     return LOG_EMBEDDER_ERROR(
         kInvalidArguments,

shell/platform/embedder/embedder.h

@@ -1368,6 +1368,15 @@ typedef struct {
   /// matches what the platform would natively resolve to as possible.
   FlutterComputePlatformResolvedLocaleCallback
       compute_platform_resolved_locale_callback;
+
+  /// The command line argument count for arguments passed through to the Dart
+  /// entrypoint.
+  int dart_entrypoint_argc;
+
+  /// The command line arguments passed through to the Dart entrypoint. The
+  /// strings must be `NULL` terminated.
+  const char* const* dart_entrypoint_argv;
+
 } FlutterProjectArgs;
 
 //------------------------------------------------------------------------------

shell/platform/embedder/fixtures/main.dart

@@ -733,3 +733,10 @@ void render_targets_are_recycled() {
   };
   window.scheduleFrame();
 }
+
+void nativeArgumentsCallback(List<String> args) native 'NativeArgumentsCallback';
+
+@pragma('vm:entry-point')
+void dart_entrypoint_args(List<String> args) {
+  nativeArgumentsCallback(args);
+}

shell/platform/embedder/tests/embedder_unittests.cc

@@ -473,6 +473,34 @@ TEST_F(EmbedderTest, VMShutsDownWhenNoEnginesInProcess) {
   }
 }
 
+//------------------------------------------------------------------------------
+///
+TEST_F(EmbedderTest, DartEntrypointArgs) {
+  auto& context = GetEmbedderContext(ContextType::kSoftwareContext);
+  EmbedderConfigBuilder builder(context);
+  builder.SetSoftwareRendererConfig();
+  builder.GetProjectArgs().dart_entrypoint_argc = 2;
+  std::vector<const char*> args = {"foo", "bar"};
+  builder.GetProjectArgs().dart_entrypoint_argv = args.data();
+  builder.SetDartEntrypoint("dart_entrypoint_args");
+  fml::AutoResetWaitableEvent callbackLatch;
+  std::vector<std::string> callbackArgs;
+  auto nativeArgumentsCallback = [&callbackArgs,
+                                  &callbackLatch](Dart_NativeArguments args) {
+    Dart_Handle exception = nullptr;
+    callbackArgs =
+        tonic::DartConverter<std::vector<std::string>>::FromArguments(
+            args, 0, exception);
+    callbackLatch.Signal();
+  };
+  context.AddNativeCallback("NativeArgumentsCallback",
+                            CREATE_NATIVE_ENTRY(nativeArgumentsCallback));
+  auto engine = builder.LaunchEngine();
+  callbackLatch.Wait();
+  ASSERT_EQ(callbackArgs[0], "foo");
+  ASSERT_EQ(callbackArgs[1], "bar");
+}
+
 //------------------------------------------------------------------------------
 /// These snapshots may be materialized from symbols and the size field may not
 /// be relevant. Since this information is redundant, engine launch should not