Fix NativePlatformConstants

Summary:
When in debug mode, PlatformConstants doesn't have a `ServerHost` constant. This wasn't captured by `NativePlatformConstants`.

Changelog:
[Android][Fixed] - Make sure ServerHost is optional in NativePlatformConstants.js

Reviewed By: rickhanlonii

Differential Revision: D19091270

fbshipit-source-id: 4b3ac73a4ab6111b3e433ecca01cc769e8cdec6b

Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h

@@ -1976,7 +1976,7 @@ namespace JS {
           RCTRequired<NSString *> Serial;
           RCTRequired<NSString *> Fingerprint;
           RCTRequired<NSString *> Model;
-          RCTRequired<NSString *> ServerHost;
+          NSString *ServerHost;
           RCTRequired<NSString *> uiMode;
         };
 
@@ -3633,7 +3633,7 @@ inline JS::NativePlatformConstantsAndroid::Constants::Builder::Builder(const Inp
   d[@"Fingerprint"] = Fingerprint;
   auto Model = i.Model.get();
   d[@"Model"] = Model;
-  auto ServerHost = i.ServerHost.get();
+  auto ServerHost = i.ServerHost;
   d[@"ServerHost"] = ServerHost;
   auto uiMode = i.uiMode.get();
   d[@"uiMode"] = uiMode;

Libraries/Utilities/NativePlatformConstantsAndroid.js

@@ -27,7 +27,7 @@ export interface Spec extends TurboModule {
     Serial: string,
     Fingerprint: string,
     Model: string,
-    ServerHost: string,
+    ServerHost?: string,
     uiMode: string,
   |};
   +getAndroidID: () => string;

Libraries/Utilities/Platform.android.js

@@ -38,7 +38,7 @@ const Platform = {
     Serial: string,
     Fingerprint: string,
     Model: string,
-    ServerHost: string,
+    ServerHost?: string,
     uiMode: string,
   |} {
     if (this.__constants == null) {

ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativePlatformConstantsAndroidSpec.java

@@ -47,11 +47,12 @@ public abstract class NativePlatformConstantsAndroidSpec extends ReactContextBas
           "Version",
           "reactNativeVersion",
           "Model",
-          "ServerHost",
           "isTesting",
           "Release"
       ));
-      Set<String> optionalFlowConstants = new HashSet<>();
+      Set<String> optionalFlowConstants = new HashSet<>(Arrays.asList(
+          "ServerHost"
+      ));
       Set<String> undeclaredConstants = new HashSet<>(constants.keySet());
       undeclaredConstants.removeAll(obligatoryFlowConstants);
       undeclaredConstants.removeAll(optionalFlowConstants);