CSSPaint: Move layout tests in csspaint/ to http/tests/csspaint/

third_party/WebKit/LayoutTests/http/tests/csspaint/resources/test-runner-invalidation-logging.js

 // Test runner for the paint worklet to test invalidation behaviour.
 //
 // Registers an promise_test per test case, which:
 //  - Creates an element.
 //  - Invalidates the style of that element.
 //  - [worklet] Worklet code logs if it got the invalidation.
 //  - Asserts that it got the correct paint invalidation.
 //
 // Usage:
 // testRunnerInvalidationLogging('background-image', [
@@ skipping 81 matching lines @@
                     // Cleanup.
                     document.body.removeChild(el);
                     resolve();
                 });
             });
 
         });
 
     }, testName);
 }