Update length limit for View.Name (#834)

(cherry picked from commit 7106a47)

Author: songy23

api/src/main/java/io/opencensus/stats/View.java

@@ -38,7 +38,7 @@
 @AutoValue
 public abstract class View {
 
-  @VisibleForTesting static final int NAME_MAX_LENGTH = 256;
+  @VisibleForTesting static final int NAME_MAX_LENGTH = 255;
 
   View() {}
 
@@ -116,7 +116,7 @@ public abstract static class Name {
 
     /**
      * Creates a {@code View.Name} from a {@code String}. Should be a ASCII string with a length no
-     * greater than 256 characters.
+     * greater than 255 characters.
      *
      * <p>Suggested format for name: {@code <web_host>/<path>}.
      *
@@ -126,7 +126,7 @@ public abstract static class Name {
     public static Name create(String name) {
       checkArgument(
           StringUtil.isPrintableString(name) && name.length() <= NAME_MAX_LENGTH,
-          "Name should be a ASCII string with a length no greater than 256 characters.");
+          "Name should be a ASCII string with a length no greater than 255 characters.");
       return new AutoValue_View_Name(name);
     }
   }

api/src/test/java/io/opencensus/stats/ViewTest.java

@@ -41,7 +41,7 @@ public final class ViewTest {
 
   @Test
   public void testConstants() {
-    assertThat(View.NAME_MAX_LENGTH).isEqualTo(256);
+    assertThat(View.NAME_MAX_LENGTH).isEqualTo(255);
   }
 
   @Test