Skip ASTextNodePerformanceTests in Test Action (#2173)

AsyncDisplayKit.xcodeproj/xcshareddata/xcschemes/AsyncDisplayKit.xcscheme

@@ -52,6 +52,11 @@
                BlueprintName = "AsyncDisplayKitTests"
                ReferencedContainer = "container:AsyncDisplayKit.xcodeproj">
             </BuildableReference>
+            <SkippedTests>
+               <Test
+                  Identifier = "ASTextNodePerformanceTests">
+               </Test>
+            </SkippedTests>
          </TestableReference>
       </Testables>
       <MacroExpansion>

AsyncDisplayKitTests/ASTextNodePerformanceTests.m

@@ -13,6 +13,10 @@
 #import "ASXCTExtensions.h"
 #include "CGRect+ASConvenience.h"
 
+/**
+ * NOTE: This test case is not run during the "test" action. You have to run it manually (click the little diamond.)
+ */
+
 @interface ASTextNodePerformanceTests : XCTestCase
 
 @end