Add support for commands

Summary: We need commands to work with `LegacyViewManagerInterop`. We will need to rethink this once Fabric has command-execution pipeline in place.

Reviewed By: shergin

Differential Revision: D17787294

fbshipit-source-id: a6b3dbfae41f04e7e7f5bafb1f7b4ad0de0eedc3

React/Fabric/Mounting/ComponentViews/InteropView/RCTLegacyViewManagerInteropComponentView.mm

@@ -46,6 +46,13 @@ using namespace facebook::react;
   }
 }
 
+- (NSString *)componentViewName_DO_NOT_USE_THIS_IS_BROKEN
+{
+  const auto &state = _state->getData();
+  RCTLegacyViewManagerInteropCoordinator *coordinator = unwrapManagedObject(state.coordinator);
+  return coordinator.componentViewName;
+}
+
 #pragma mark - RCTComponentViewProtocol
 
 + (ComponentDescriptorProvider)componentDescriptorProvider

ReactCommon/fabric/components/legacyviewmanagerinterop/RCTLegacyViewManagerInteropCoordinator.h

@@ -23,6 +23,8 @@ typedef void (^InterceptorBlock)(std::string eventName, folly::dynamic event);
 
 - (void)setProps:(folly::dynamic const &)props forView:(UIView *)view;
 
+- (NSString *)componentViewName;
+
 @end
 
 NS_ASSUME_NONNULL_END

ReactCommon/fabric/components/legacyviewmanagerinterop/RCTLegacyViewManagerInteropCoordinator.mm

@@ -8,6 +8,7 @@
 #include "RCTLegacyViewManagerInteropCoordinator.h"
 #include <React/RCTComponentData.h>
 #include <React/RCTFollyConvert.h>
+#include <React/RCTUtils.h>
 #include <folly/json.h>
 
 using namespace facebook::react;
@@ -54,4 +55,9 @@ using namespace facebook::react;
   [_componentData setProps:convertedProps forView:view];
 }
 
+- (NSString *)componentViewName
+{
+  return RCTDropReactPrefixes(_componentData.name);
+}
+
 @end