Add C++ AndroidTextInput component for backwards-compatible Fabric support of TextInput on Android

Summary: Support existing, backwards-compatible AndroidTextInput component for minimal support of TextInput on Android.

Reviewed By: shergin, mdvacca

Differential Revision: D17086758

fbshipit-source-id: 25726f22229e0d5dfe96eb36b386a5317601283d

ReactCommon/fabric/components/textinput/androidtextinput/AndroidTextInputComponentDescriptor.h

@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <react/core/ConcreteComponentDescriptor.h>
+#include "AndroidTextInputShadowNode.h"
+
+namespace facebook {
+namespace react {
+
+/*
+ * Descriptor for <AndroidTextInput> component.
+ */
+class AndroidTextInputComponentDescriptor final
+    : public ConcreteComponentDescriptor<AndroidTextInputShadowNode> {
+ public:
+  AndroidTextInputComponentDescriptor(
+      EventDispatcher::Shared eventDispatcher,
+      const ContextContainer::Shared &contextContainer)
+      : ConcreteComponentDescriptor<AndroidTextInputShadowNode>(
+            eventDispatcher,
+            contextContainer) {}
+
+ protected:
+  void adopt(UnsharedShadowNode shadowNode) const override {
+    assert(std::dynamic_pointer_cast<AndroidTextInputShadowNode>(shadowNode));
+    auto concreteShadowNode =
+        std::static_pointer_cast<AndroidTextInputShadowNode>(shadowNode);
+
+    concreteShadowNode->setContextContainer(
+        const_cast<ContextContainer *>(getContextContainer().get()));
+
+    concreteShadowNode->dirtyLayout();
+    concreteShadowNode->enableMeasurement();
+
+    ConcreteComponentDescriptor::adopt(shadowNode);
+  }
+};
+
+} // namespace react
+} // namespace facebook