Add support for selectionColor on Android TextInput

Summary:
public
This adds support to set the highlight color on TextInput on Android.  See https://github.com/facebook/react-native/pull/5678 for the iOS implementation.

Note : We will merge these two properties with one name 'selectionColor' in a follow on diff, and may move it to a style.

Reviewed By: nicklockwood

Differential Revision: D2895253

fb-gh-sync-id: 6f2c08c812ff0028973185356a8af285f7dd7969

Libraries/Components/TextInput/TextInput.js

@@ -226,16 +226,15 @@ var TextInput = React.createClass({
      * The text color of the placeholder string
      */
     placeholderTextColor: PropTypes.string,
-    /**
-    * The highlight and cursor color of the text input
-    * @platform ios
-    */
-    tintColor: PropTypes.string,
     /**
      * If true, the text input obscures the text entered so that sensitive text
      * like passwords stay secure. The default value is false.
      */
     secureTextEntry: PropTypes.bool,
+    /**
+    * The highlight (and cursor on ios) color of the text input
+    */
+    selectionColor: PropTypes.string,
     /**
      * See DocumentSelectionState.js, some state that is responsible for
      * maintaining selection information for a document
@@ -511,6 +510,7 @@ var TextInput = React.createClass({
         password={this.props.password || this.props.secureTextEntry}
         placeholder={this.props.placeholder}
         placeholderTextColor={this.props.placeholderTextColor}
+        selectionColor={this.props.selectionColor}
         text={this._getText()}
         underlineColorAndroid={this.props.underlineColorAndroid}
         children={children}