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

third_party/WebKit/LayoutTests/http/tests/csspaint/resources/generate-paint-style-logging.js

 // Generates code for a CSS paint API function which logs the given properties
 // to the console.
 //
 // Usage:
 // generatePaintStyleLogging([
 //      '--foo',
 //      'line-height',
 // ]);
 
 function generatePaintStyleLogging(properties) {
@@ skipping 10 matching lines @@
                         serialized = '[' + value.constructor.name + '=' + value.cssText + ']';
                     } else {
                         serialized = '[null]';
                     }
                     console.log(properties[i] + ': ' + serialized);
                 }
             }
         });
     `;
 }