Add UIContentSizeCategoryDidChangeNotification to re-render text

Summary:
Changelog:
[Internal] - Add UIContentSizeCategoryDidChangeNotification to re-render text

We don't need to restart the app to re-render text now, but we still need to swipe the screen or click on buttons to force to refresh. We may address this in the future.

Reviewed By: PeteTheHeat

Differential Revision: D22867293

fbshipit-source-id: 4747a45adc2bdc638cf7ef9c07a9484e48600583

React/Fabric/RCTSurfacePresenter.mm

@@ -120,6 +120,11 @@ static BackgroundExecutor RCTGetBackgroundExecutor()
     _observers = [NSMutableArray array];
 
     _scheduler = [self _createScheduler];
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(_handleContentSizeCategoryDidChangeNotification:)
+                                                 name:UIContentSizeCategoryDidChangeNotification
+                                               object:nil];
   }
 
   return self;
@@ -425,6 +430,23 @@ static BackgroundExecutor RCTGetBackgroundExecutor()
   }];
 }
 
+- (void)_handleContentSizeCategoryDidChangeNotification:(NSNotification *)notification
+{
+  RCTScheduler *scheduler = [self _scheduler];
+
+  [_surfaceRegistry enumerateWithBlock:^(NSEnumerator<RCTFabricSurface *> *enumerator) {
+    for (RCTFabricSurface *surface in enumerator) {
+      LayoutContext layoutContext = RCTGetLayoutContext();
+
+      LayoutConstraints layoutConstraints = RCTGetLayoutConstraintsForSize(surface.minimumSize, surface.maximumSize);
+
+      [scheduler constraintSurfaceLayoutWithLayoutConstraints:layoutConstraints
+                                                layoutContext:layoutContext
+                                                    surfaceId:surface.rootTag];
+    }
+  }];
+}
+
 #pragma mark - RCTSchedulerDelegate
 
 - (void)schedulerDidFinishTransaction:(MountingCoordinator::Shared const &)mountingCoordinator