(Easy) 1/n In RCTSurfaceHostingComponent, access ckComponent from main queue to pass assertion

Summary:
Changelog:

Before diff, we always hit assert the `'self.component' must be called on the main thread` assertion whenever we open a surface with a RCTSurfaceHostingComponent (React Native surface inside a CKComponent).

Reviewed By: RSNara

Differential Revision: D35152263

fbshipit-source-id: 1b06ca9d2ae7ca211120b71504e2eeaabaaf3bfd

Author: p-sun

Libraries/SurfaceHostingComponent/RCTSurfaceHostingComponentController.mm

@@ -77,18 +77,34 @@ - (void)updateSurfaceWithComponent:(RCTSurfaceHostingComponent *)component
 
 - (void)setIntrinsicSize:(CGSize)intrinsicSize
 {
-  [self.component updateState:^(RCTSurfaceHostingComponentState *state) {
-    return [RCTSurfaceHostingComponentState newWithStage:state.stage
-                                           intrinsicSize:intrinsicSize];
-  } mode:[self suitableStateUpdateMode]];
+  __weak __typeof(self) weakSelf = self;
+  dispatch_async(dispatch_get_main_queue(), ^{
+    __strong __typeof(self) strongSelf = weakSelf;
+    if (!strongSelf) {
+      return;
+    }
+    
+    [strongSelf.component updateState:^(RCTSurfaceHostingComponentState *state) {
+      return [RCTSurfaceHostingComponentState newWithStage:state.stage
+                                             intrinsicSize:intrinsicSize];
+    } mode:[strongSelf suitableStateUpdateMode]];
+  });
 }
 
 - (void)setStage:(RCTSurfaceStage)stage
 {
-  [self.component updateState:^(RCTSurfaceHostingComponentState *state) {
-    return [RCTSurfaceHostingComponentState newWithStage:stage
-                                           intrinsicSize:state.intrinsicSize];
-  } mode:[self suitableStateUpdateMode]];
+  __weak __typeof(self) weakSelf = self;
+  dispatch_async(dispatch_get_main_queue(), ^{
+    __strong __typeof(self) strongSelf = weakSelf;
+    if (!strongSelf) {
+      return;
+    }
+    
+    [strongSelf.component updateState:^(RCTSurfaceHostingComponentState *state) {
+      return [RCTSurfaceHostingComponentState newWithStage:stage
+                                             intrinsicSize:state.intrinsicSize];
+    } mode:[strongSelf suitableStateUpdateMode]];
+  });
 }
 
 - (CKUpdateMode)suitableStateUpdateMode