Fix a typo on displaying Aggregation Type for a View on StatsZ page. (#1170)

(cherry picked from commit e830bee)

Author: songy23

CHANGELOG.md

@@ -1,4 +1,5 @@
 ## Unreleased
+- Fix a typo on displaying Aggregation Type for a View on StatsZ page.
 
 ## 0.13.0 - 2018-04-27
 - Support building with Java 9.

contrib/zpages/src/main/java/io/opencensus/contrib/zpages/StatszZPageHandler.java

@@ -321,8 +321,8 @@ private static void emitViewInfo(
             .match(
                 Functions.returnConstant("Sum"),
                 Functions.returnConstant("Count"),
-                Functions.returnConstant("Last Value"),
                 Functions.returnConstant("Distribution"),
+                Functions.returnConstant("Last Value"),
                 new Function<Aggregation, String>() {
                   @Override
                   public String apply(Aggregation arg) {

contrib/zpages/src/test/java/io/opencensus/contrib/zpages/StatszZPageHandlerTest.java

@@ -223,8 +223,8 @@ private static void assertContainsViewData(OutputStream output, ViewData viewDat
             .match(
                 Functions.returnConstant("Sum"),
                 Functions.returnConstant("Count"),
-                Functions.returnConstant("Last Value"),
                 Functions.returnConstant("Distribution"),
+                Functions.returnConstant("Last Value"),
                 new Function<Aggregation, String>() {
                   @Override
                   public String apply(Aggregation arg) {