Fix for InterpolatorType crash

Summary:
We're currently getting a redbox in Turkish when we try to convert the string 'easeInEaseOut' to an InterpolatorType. This is because I use toLowerCase() to compare the string without setting a locale; in Turkish, the capital letter 'I' doesn't convert to 'i' when you lowercase it, but rather to 'ı' (http://www.i18nguy.com/unicode/turkish-i18n.html).

Passing in a locale param to `toLowerCase()` fixes it. Also updating the test.

Differential Revision: D10315474

fbshipit-source-id: 54be3ff1d3f91cb2ec765ff705ac364b976b8c6f

Author: Emily Janzer

ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/InterpolatorType.java

@@ -5,6 +5,8 @@
 
 package com.facebook.react.uimanager.layoutanimation;
 
+import java.util.Locale;
+
 /**
  * Enum representing the different interpolators that can be used in layout animation configuration.
  */
@@ -16,7 +18,7 @@
   SPRING;
 
   public static InterpolatorType fromString(String name) {
-    switch (name.toLowerCase()) {
+    switch (name.toLowerCase(Locale.US)) {
       case "linear":
         return LINEAR;
       case "easein":

ReactAndroid/src/test/java/com/facebook/react/uimanager/layoutanimation/InterpolatorTypeTest.java

@@ -8,6 +8,7 @@
 package com.facebook.react.uimanager.layoutanimation;
 
 import com.facebook.react.uimanager.layoutanimation.InterpolatorType;
+import java.util.Locale;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
@@ -32,6 +33,12 @@ public void testOtherCases() {
     assertThat(InterpolatorType.fromString("easeineaseout")).isEqualTo(InterpolatorType.EASE_IN_EASE_OUT);
   }
 
+  @Test
+  public void testLocales() {
+    Locale.setDefault(Locale.forLanguageTag("tr-TR"));
+    assertThat(InterpolatorType.fromString("easeInEaseOut")).isEqualTo(InterpolatorType.EASE_IN_EASE_OUT);
+  }
+
   @Test(expected = IllegalArgumentException.class)
   public void testInvalidInterpolatorTypes() throws IllegalArgumentException {
     InterpolatorType.fromString("ease_in_ease_out");