feat(New Webview Prop): Added Android overscroll property (#54)

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

 import android.net.Uri;
 import android.os.Build;
 import android.text.TextUtils;
+import android.view.View;
 import android.view.ViewGroup.LayoutParams;
 import android.webkit.ConsoleMessage;
 import android.webkit.CookieManager;
     view.getSettings().setJavaScriptEnabled(enabled);
   }
 
+  @ReactProp(name = "overScrollMode")
+  public void setOverScrollMode(WebView view, String overScrollModeString) {
+    Integer overScrollMode;
+    switch (overScrollModeString) {
+      case "never":
+        overScrollMode = View.OVER_SCROLL_NEVER;
+        break;
+      case "content":
+        overScrollMode = View.OVER_SCROLL_IF_CONTENT_SCROLLS;
+        break;
+      case "always":
+      default:
+        overScrollMode = View.OVER_SCROLL_ALWAYS;
+        break;
+    }
+    view.setOverScrollMode(overScrollMode);
+  }
+
   @ReactProp(name = "thirdPartyCookiesEnabled")
   public void setThirdPartyCookiesEnabled(WebView view, boolean enabled) {
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

docs/Reference.md

 - [`userAgent`](Reference.md#useragent)
 - [`allowsInlineMediaPlayback`](Reference.md#allowsinlinemediaplayback)
 - [`bounces`](Reference.md#bounces)
+- [`overScrollMode`](Reference.md#overscrollmode)
 - [`contentInset`](Reference.md#contentinset)
 - [`dataDetectorTypes`](Reference.md#datadetectortypes)
 - [`scrollEnabled`](Reference.md#scrollenabled)
 
 ---
 
+### `overScrollMode`
+
+Specifies the over scroll mode.
+
+Possible values for `overScrollMode` are:
+
+- `always` (default) - Always allow a user to over-scroll this view, provided it is a view that can scroll.
+- `content` - Allow a user to over-scroll this view only if the content is large enough to meaningfully scroll, provided it is a view that can scroll.
+- `never` - Never allow a user to over-scroll this view.
+
+| Type   | Required | Platform |
+| ------ | -------- | -------- |
+| string | No       | Android  |
+
+---
+
 ### `contentInset`
 
 The amount by which the web view content is inset from the edges of the scroll view. Defaults to {top: 0, left: 0, bottom: 0, right: 0}.

js/WebView.android.js

  */
 class WebView extends React.Component<WebViewSharedProps, State> {
   static defaultProps = {
+    overScrollMode: 'always',
     javaScriptEnabled: true,
     thirdPartyCookiesEnabled: true,
     scalesPageToFit: true,
         domStorageEnabled={this.props.domStorageEnabled}
         messagingEnabled={typeof this.props.onMessage === 'function'}
         onMessage={this.onMessage}
+        overScrollMode={this.props.overScrollMode}
         contentInset={this.props.contentInset}
         automaticallyAdjustContentInsets={
           this.props.automaticallyAdjustContentInsets

js/WebViewTypes.js

   | 'none'
   | 'all';
 
+export type OverScrollModeType = 'always' | 'content' | 'never';
+
 export type WebViewSourceUri = $ReadOnly<{|
   /**
    * The URI to load in the `WebView`. Can be a local or remote file.
   onNavigationStateChange?: (event: WebViewNavigation) => mixed,
   onContentSizeChange?: (event: WebViewEvent) => mixed,
 
+  /**
+   * https://developer.android.com/reference/android/view/View#OVER_SCROLL_NEVER
+   * Sets the overScrollMode. Possible values are:
+   *
+   * - `'always'` (default)
+   * - `'content'`
+   * - `'never'`
+   *
+   * @platform android
+   */
+  overScrollMode?: ?OverScrollModeType,
+
   /**
    * Sets whether Geolocation is enabled. The default is false.
    * @platform android