Integrate AndroidSwitch into Fabric on Android

Summary:
In this diff we integrate the Switch component on Android in Fabric. Since the component has a custom measure function, we need to write some C++ to call the measure method in Java.

The component isn't fully functional yet (setNativeProps isn't supported in Fabric) and has some problems with measuring itself. I will fix the component in the next diffs in this stack.

Reviewed By: JoshuaGross

Differential Revision: D17571258

fbshipit-source-id: be4e201495b9b197ddec44ee3484357bfb6225a8

ReactCommon/fabric/components/switch/androidswitch/AndroidSwitchMeasurementsManager.cpp

@@ -0,0 +1,65 @@
+/**
+ * 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.
+ */
+
+#include "AndroidSwitchMeasurementsManager.h"
+
+#include <fb/fbjni.h>
+#include <react/core/conversions.h>
+#include <react/jni/ReadableNativeMap.h>
+
+using namespace facebook::jni;
+
+namespace facebook {
+namespace react {
+
+Size AndroidSwitchMeasurementsManager::measure(
+    LayoutConstraints layoutConstraints) const {
+  {
+    std::lock_guard<std::mutex> lock(mutex_);
+    if (hasBeenMeasured_) {
+      return cachedMeasurement_;
+    }
+  }
+
+  const jni::global_ref<jobject> &fabricUIManager =
+      contextContainer_->at<jni::global_ref<jobject>>("FabricUIManager");
+
+  static auto measure =
+      jni::findClassStatic("com/facebook/react/fabric/FabricUIManager")
+          ->getMethod<jlong(
+              jstring,
+              ReadableMap::javaobject,
+              ReadableMap::javaobject,
+              ReadableMap::javaobject,
+              jfloat,
+              jfloat,
+              jfloat,
+              jfloat)>("measure");
+
+  auto minimumSize = layoutConstraints.minimumSize;
+  auto maximumSize = layoutConstraints.maximumSize;
+
+  local_ref<JString> componentName = make_jstring("AndroidSwitch");
+
+  auto measurement = yogaMeassureToSize(measure(
+      fabricUIManager,
+      componentName.get(),
+      nullptr,
+      nullptr,
+      nullptr,
+      minimumSize.width,
+      maximumSize.width,
+      minimumSize.height,
+      maximumSize.height));
+
+  std::lock_guard<std::mutex> lock(mutex_);
+  cachedMeasurement_ = measurement;
+  return measurement;
+}
+
+} // namespace react
+} // namespace facebook