Name a bunch of anonymous RN contexts

Summary:
Changelog:
[General] [Changed] - Added (DEV-only) `displayName` to some RN contexts to make them more easy to differentiate when debugging.

Reviewed By: lunaleaps

Differential Revision: D24993068

fbshipit-source-id: 4904259eda50444c2f74700a3540ff4fd02ac322

Libraries/Components/ScrollView/ScrollViewContext.js

@@ -15,7 +15,9 @@ import * as React from 'react';
 type Value = {horizontal: boolean} | null;
 
 const ScrollViewContext: React.Context<Value> = React.createContext(null);
-
+if (__DEV__) {
+  ScrollViewContext.displayName = 'ScrollViewContext';
+}
 export default ScrollViewContext;
 
 export const HORIZONTAL: Value = Object.freeze({horizontal: true});

Libraries/Image/ImageAnalyticsTagContext.js

@@ -18,4 +18,8 @@ const Context: React.Context<ContextType> = React.createContext<ContextType>(
   null,
 );
 
+if (__DEV__) {
+  Context.displayName = 'ImageAnalyticsTagContext';
+}
+
 export default Context;

Libraries/Lists/VirtualizedListContext.js

@@ -69,6 +69,9 @@ type Context = $ReadOnly<{
 export const VirtualizedListContext: React.Context<?Context> = React.createContext(
   null,
 );
+if (__DEV__) {
+  VirtualizedListContext.displayName = 'VirtualizedListContext';
+}
 
 /**
  * Resets the context. Intended for use by portal-like components (e.g. Modal).

Libraries/ReactNative/RootTag.js

@@ -19,6 +19,10 @@ export const RootTagContext: React$Context<RootTag> = React.createContext<RootTa
   0,
 );
 
+if (__DEV__) {
+  RootTagContext.displayName = 'RootTagContext';
+}
+
 /**
  * Intended to only be used by `AppContainer`.
  */

Libraries/Text/TextAncestor.js

@@ -15,4 +15,10 @@ const React = require('react');
 /**
  * Whether the current element is the descendant of a <Text> element.
  */
-module.exports = (React.createContext(false): React$Context<$FlowFixMe>);
+const TextAncestorContext = (React.createContext(
+  false,
+): React$Context<$FlowFixMe>);
+if (__DEV__) {
+  TextAncestorContext.displayName = 'TextAncestorContext';
+}
+module.exports = TextAncestorContext;

Libraries/Utilities/PerformanceLoggerContext.js

@@ -23,4 +23,7 @@ import type {IPerformanceLogger} from './createPerformanceLogger';
 const PerformanceLoggerContext: React.Context<IPerformanceLogger> = React.createContext(
   GlobalPerformanceLogger,
 );
+if (__DEV__) {
+  PerformanceLoggerContext.displayName = 'PerformanceLoggerContext';
+}
 module.exports = PerformanceLoggerContext;