Fix crash in AccessibilityManager

Summary:
Fix this crash by making sure the RCTDeviceInfo is doing things on the main thread.
This fixes #14043.

Reviewed By: ashwinb

Differential Revision: D5286746

fbshipit-source-id: cce3426a6e7e7221cff82f8bca663d9a060dd358

IntegrationTests/AccessibilityManagerTest.js

@@ -0,0 +1,52 @@
+/**
+ * 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.
+ *
+ * @flow
+ * @providesModule AccessibilityManagerTest
+ */
+'use strict';
+
+const React = require('react');
+const ReactNative = require('react-native');
+const { View } = ReactNative;
+const RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
+const {
+  TestModule,
+  AccessibilityManager,
+} = ReactNative.NativeModules;
+
+
+class AccessibilityManagerTest extends React.Component {
+  componentDidMount() {
+    AccessibilityManager.setAccessibilityContentSizeMultipliers({
+      'extraSmall': 1.0,
+      'small': 2.0,
+      'medium': 3.0,
+      'large': 4.0,
+      'extraLarge': 5.0,
+      'extraExtraLarge': 6.0,
+      'extraExtraExtraLarge': 7.0,
+      'accessibilityMedium': 8.0,
+      'accessibilityLarge': 9.0,
+      'accessibilityExtraLarge': 10.0,
+      'accessibilityExtraExtraLarge': 11.0,
+      'accessibilityExtraExtraExtraLarge': 12.0,
+    });
+    RCTDeviceEventEmitter.addListener('didUpdateDimensions', update => {
+      TestModule.markTestPassed(update.window.fontScale === 4.0);
+    });
+  }
+
+  render(): React.Element<any> {
+    return <View />;
+  }
+}
+
+AccessibilityManagerTest.displayName = 'AccessibilityManagerTest';
+
+module.exports = AccessibilityManagerTest;

IntegrationTests/IntegrationTestsApp.js

@@ -35,6 +35,7 @@ var TESTS = [
   require('./PromiseTest'),
   require('./SyncMethodTest'),
   require('./WebSocketTest'),
+  require('./AccessibilityManagerTest'),
 ];
 
 TESTS.forEach(

RNTester/RNTesterIntegrationTests/RNTesterIntegrationTests.m

@@ -74,6 +74,7 @@ - (void)testTheTester_ExpectError
 RCT_TEST(SyncMethodTest)
 RCT_TEST(PromiseTest)
 RCT_TEST_ONLY_WITH_PACKAGER(WebSocketTest)
+RCT_TEST(AccessibilityManagerTest)
 
 
 @end

React/Modules/RCTDeviceInfo.m

@@ -67,7 +67,7 @@ - (void)setBridge:(RCTBridge *)bridge
 
 - (void)invalidate
 {
-  dispatch_async(dispatch_get_main_queue(), ^{
+  RCTExecuteOnMainQueue(^{
     self->_bridge = nil;
     [[NSNotificationCenter defaultCenter] removeObserver:self];
   });
@@ -82,18 +82,30 @@ - (void)invalidate
 
 - (void)didReceiveNewContentSizeMultiplier
 {
-  // Report the event across the bridge.
+  RCTBridge *bridge = _bridge;
+  RCTExecuteOnMainQueue(^{
+    // Report the event across the bridge.
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
-  [_bridge.eventDispatcher sendDeviceEventWithName:@"didUpdateDimensions"
-                                              body:RCTExportedDimensions(_bridge)];
+    [bridge.eventDispatcher sendDeviceEventWithName:@"didUpdateDimensions"
+                                        body:RCTExportedDimensions(bridge)];
 #pragma clang diagnostic pop
+  });
 }
 
-
 - (void)interfaceOrientationDidChange
 {
 #if !TARGET_OS_TV
+  __weak typeof(self) weakSelf = self;
+  RCTExecuteOnMainQueue(^{
+    [weakSelf _interfaceOrientationDidChange];
+  });
+#endif
+}
+
+
+- (void)_interfaceOrientationDidChange
+{
   UIInterfaceOrientation nextOrientation = [RCTSharedApplication() statusBarOrientation];
 
   // Update when we go from portrait to landscape, or landscape to portrait
@@ -109,7 +121,6 @@ - (void)interfaceOrientationDidChange
       }
 
   _currentInterfaceOrientation = nextOrientation;
-#endif
 }