JavaScript: Add basic modelling of React Native `WebView`s.

javascript/ql/src/semmle/javascript/frameworks/ReactNative.qll

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+/**
+ * Provides classes for working with [React Native](https://facebook.github.io/react-native) code.
+ */
+
+import javascript
+
+module ReactNative {
+  /** A `WebView` JSX element. */
+  class WebViewElement extends DataFlow::ValueNode, DataFlow::DefaultSourceNode {
+    override JSXElement astNode;
+
+    WebViewElement() {
+      DataFlow::moduleMember("react-native", "WebView").flowsToExpr(astNode.getNameExpr())
+    }
+  }
+}

javascript/ql/test/library-tests/frameworks/ReactNative/WebView.expected

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+| webview.js:6:12:6:56 | <WebVie ... om'}}/> |

javascript/ql/test/library-tests/frameworks/ReactNative/WebView.ql

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+import javascript
+
+from ReactNative::WebViewElement wv
+select wv

javascript/ql/test/library-tests/frameworks/ReactNative/webview.js

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+import { Component } from 'react';
+import { WebView } from 'react-native';
+
+class LgtmView extends Component {
+  render() {
+    return <WebView source={{uri: 'https://lgtm.com'}}/>;
+  }
+}