Add an 'Experiments' class to enable/disable experiments.

ReactAndroid/src/main/java/com/facebook/react/Experiments.java

@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react;
+
+import java.util.HashSet;
+import java.util.Set;
+
+
+/**
+ * This class exposes a way to enable/disable experimental features in React Native.
+ */
+public class Experiments {
+
+  // Enables Hot Module Replacement menu item in the developer menu
+  public static String HOT_MODULE_REPLACEMENT = "HOT_MODULE_REPLACEMENT";
+
+  private static Set<String> enabledExperiments;
+
+  /**
+   * Enables an experiment
+   */
+  public static void enableExperiment(String experiment) {
+    if (enabledExperiments == null) {
+      enabledExperiments = new HashSet<>();
+    }
+    enabledExperiments.add(experiment);
+  }
+
+  /**
+   * Disables an experiment
+   */
+  public static void disableExperiment(String experiment) {
+    if (enabledExperiments != null) {
+      enabledExperiments.remove(experiment);
+    }
+  }
+
+  /**
+   * Checks if an experiment is enabled
+   */
+  public static boolean isExperimentEnabled(String experiment) {
+    return enabledExperiments != null && enabledExperiments.contains(experiment);
+  }
+}

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerImpl.java

@@ -36,6 +36,7 @@
 
 import com.facebook.common.logging.FLog;
 import com.facebook.infer.annotation.Assertions;
+import com.facebook.react.Experiments;
 import com.facebook.react.R;
 import com.facebook.react.bridge.CatalystInstance;
 import com.facebook.react.bridge.DefaultNativeModuleCallExceptionHandler;
@@ -265,17 +266,21 @@ public void onOptionSelected() {
             handleReloadJS();
           }
         });
-    options.put(
-            mDevSettings.isHotModuleReplacementEnabled()
-                    ? mApplicationContext.getString(R.string.catalyst_hot_module_replacement_off)
-                    : mApplicationContext.getString(R.string.catalyst_hot_module_replacement),
-            new DevOptionHandler() {
-              @Override
-              public void onOptionSelected() {
-                mDevSettings.setHotModuleReplacementEnabled(!mDevSettings.isHotModuleReplacementEnabled());
-                handleReloadJS();
-              }
-            });
+
+    if (Experiments.isExperimentEnabled(Experiments.HOT_MODULE_REPLACEMENT)) {
+      options.put(
+        mDevSettings.isHotModuleReplacementEnabled()
+          ? mApplicationContext.getString(R.string.catalyst_hot_module_replacement_off)
+          : mApplicationContext.getString(R.string.catalyst_hot_module_replacement),
+        new DevOptionHandler() {
+          @Override
+          public void onOptionSelected() {
+            mDevSettings.setHotModuleReplacementEnabled(!mDevSettings.isHotModuleReplacementEnabled());
+            handleReloadJS();
+          }
+        });
+    }
+
     options.put(
         mDevSettings.isReloadOnJSChangeEnabled()
             ? mApplicationContext.getString(R.string.catalyst_live_reload_off)