Fixes ActivityIndicatorIOS doesn't hide initially

Summary:
I used the reproducible steps as described in origin bug ticket #7987 as test plan.
This has the same contents as PR #8130 but then against master per janicduplessis request.
Closes https://github.com/facebook/react-native/pull/8134

Differential Revision: D3491126

fbshipit-source-id: a22669dc998f82b36fbe31d882d0a29f0912e2ee

React/Views/RCTActivityIndicatorView.h

@@ -0,0 +1,13 @@
+/**
+ * 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.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface RCTActivityIndicatorView : UIActivityIndicatorView
+@end

React/Views/RCTActivityIndicatorView.m

@@ -0,0 +1,24 @@
+/**
+ * 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.
+ */
+
+#import "RCTActivityIndicatorView.h"
+
+@implementation RCTActivityIndicatorView {
+}
+
+- (void)setHidden:(BOOL)hidden
+{
+  if ([self hidesWhenStopped] && ![self isAnimating]) {
+    [super setHidden: YES];
+  } else {
+    [super setHidden: hidden];
+  }
+}
+
+@end

React/Views/RCTActivityIndicatorViewManager.m

@@ -8,7 +8,7 @@
  */
 
 #import "RCTActivityIndicatorViewManager.h"
-
+#import "RCTActivityIndicatorView.h"
 #import "RCTConvert.h"
 
 @implementation RCTConvert (UIActivityIndicatorView)
@@ -29,7 +29,7 @@ RCT_EXPORT_MODULE()
 
 - (UIView *)view
 {
-  return [UIActivityIndicatorView new];
+  return [RCTActivityIndicatorView new];
 }
 
 RCT_EXPORT_VIEW_PROPERTY(color, UIColor)