RN picker - implement background color

Summary:
add support to the android implementation of the Picker component for setting the background color.

Changelog: [Android] [Added] - Support item background color in Dialog Picker

Differential Revision: D20566131

fbshipit-source-id: d693b40803fa1051ec955c5728994c820fecd9e9

Libraries/Components/Picker/AndroidDialogPickerNativeComponent.js

@@ -41,6 +41,7 @@ type NativeProps = $ReadOnly<{|
 
   // Props
   color?: ?ColorValue,
+  backgroundColor?: ?ColorValue,
   enabled?: WithDefault<boolean, true>,
   items: $ReadOnlyArray<PickerItem>,
   prompt?: WithDefault<string, ''>,

Libraries/Components/Picker/AndroidDropdownPickerNativeComponent.js

@@ -41,6 +41,7 @@ type NativeProps = $ReadOnly<{|
 
   // Props
   color?: ?ColorValue,
+  backgroundColor?: ?ColorValue,
   enabled?: WithDefault<boolean, true>,
   items: $ReadOnlyArray<PickerItem>,
   prompt?: WithDefault<string, ''>,

Libraries/Components/Picker/Picker.js

@@ -96,6 +96,12 @@ type PickerProps = $ReadOnly<{|
    */
   itemStyle?: ?TextStyleProp,
 
+  /**
+   * Color of the item background.
+   * @platform android
+   */
+  backgroundColor?: ColorValue,
+
   /**
    * Prompt string for this picker, used on Android in dialog mode as the title of the dialog.
    * @platform android

Libraries/Components/Picker/PickerAndroid.android.js

@@ -21,6 +21,7 @@ import StyleSheet from '../../StyleSheet/StyleSheet';
 import invariant from 'invariant';
 import processColor from '../../StyleSheet/processColor';
 
+import type {ColorValue} from '../../StyleSheet/StyleSheetTypes';
 import type {SyntheticEvent} from '../../Types/CoreEventTypes';
 import type {TextStyleProp} from '../../StyleSheet/StyleSheet';
 
@@ -36,6 +37,7 @@ type Props = $ReadOnly<{|
   accessibilityLabel?: ?Stringish,
   children?: React.Node,
   style?: ?TextStyleProp,
+  backgroundColor?: ?ColorValue,
   selectedValue?: ?PickerItemValue,
   enabled?: ?boolean,
   mode?: ?('dialog' | 'dropdown'),
@@ -123,6 +125,7 @@ function PickerAndroid(props: Props): React.Node {
       styles.pickerAndroid,
       props.style,
     ),
+    backgroundColor: props.backgroundColor,
     testID: props.testID,
   };
   return props.mode === 'dropdown' ? (