Share HandlerInterceptors in ResourceHandlerMapping

Prior to this commit, the Resource `HandlerMapping` configured by
`@EnableSpringMvc` would be set up with only one custom
`HandlerInterceptor` (the one exposing the `ResourceUrlProvider` for
resolving URLs of static resources).

This behavior is not consistent with the rest of the default
configuration which leverages the interceptors configured against the
interceptor registry (with possible user-provided ones).

This change allows to register interceptors against resource handling;
this can be useful for metrics purposes, as in
spring-projects/spring-boot#10335.

Issue: SPR-16034

spring-webmvc/src/main/java/org/springframework/web/servlet/config/annotation/WebMvcConfigurationSupport.java

@@ -483,7 +483,7 @@ public class WebMvcConfigurationSupport implements ApplicationContextAware, Serv
 		if (handlerMapping != null) {
 			handlerMapping.setPathMatcher(mvcPathMatcher());
 			handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
-			handlerMapping.setInterceptors(new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider()));
+			handlerMapping.setInterceptors(getInterceptors());
 			handlerMapping.setCorsConfigurations(getCorsConfigurations());
 		}
 		else {

spring-webmvc/src/test/java/org/springframework/web/servlet/config/annotation/WebMvcConfigurationSupportExtensionTests.java

@@ -160,9 +160,11 @@ public class WebMvcConfigurationSupportExtensionTests {
 		chain = handlerMapping.getHandler(new MockHttpServletRequest("GET", "/resources/foo.gif"));
 		assertNotNull(chain);
 		assertNotNull(chain.getHandler());
-		assertEquals(Arrays.toString(chain.getInterceptors()), 2, chain.getInterceptors().length);
+		assertEquals(Arrays.toString(chain.getInterceptors()), 4, chain.getInterceptors().length);
 		// PathExposingHandlerInterceptor at chain.getInterceptors()[0]
-		assertEquals(ResourceUrlProviderExposingInterceptor.class, chain.getInterceptors()[1].getClass());
+		assertEquals(LocaleChangeInterceptor.class, chain.getInterceptors()[1].getClass());
+		assertEquals(ConversionServiceExposingInterceptor.class, chain.getInterceptors()[2].getClass());
+		assertEquals(ResourceUrlProviderExposingInterceptor.class, chain.getInterceptors()[3].getClass());
 
 		handlerMapping = (AbstractHandlerMapping) this.config.defaultServletHandlerMapping();
 		handlerMapping.setApplicationContext(this.context);