CL to reproduce crbug.com/680768 (do not commit)

third_party/WebKit/LayoutTests/fast/canvas/script-tests/canvas-blend-image.js

 description("Series of tests to ensure correct results on applying different blend modes.");
 
 var tmpimg = document.createElement('canvas');
 tmpimg.width = 200;
 tmpimg.height = 200;
 ctx = tmpimg.getContext('2d');
 
 // Create the image for blending test with images.
 var img = document.createElement('canvas');
 img.width = 200;
@@ skipping 87 matching lines @@
   ['hue',
          [[93, 0, 0, 255],[31, 31, 0, 255],[0, 46, 0, 255],[0, 0, 255, 255]],
          [[49, 0, 127, 255],[16, 16, 127, 255],[0, 25, 127, 255],[0, 0, 255, 255]],
          [[175, 0, 0, 255],[144, 144, 0, 255],[0, 88, 0, 255],[0, 0, 255, 255]],
          [[116, 0, 84, 191],[96, 96, 84, 191],[0, 58, 84, 191],[0, 0, 255, 191]]
   ],
   ['saturation',
          [[0, 0, 255, 255],[0, 0, 255, 255],[14, 14, 142, 255],[0, 0, 255, 255]],
          [[0, 0, 255, 255],[0, 0, 255, 255],[7, 7, 198, 255],[0, 0, 255, 255]],
          [[128, 0, 127, 255],[128, 128, 127, 255],[7, 71, 70, 255],[0, 0, 255, 255]],
-         [[85, 0, 167, 191],[85, 85, 167, 191],[0, 48, 130, 191],[0, 0, 255, 191]]
+         [[85, 0, 167, 191],[85, 85, 167, 191],[4, 48, 130, 191],[0, 0, 255, 191]]
   ],
   ['color',
          [[93, 0, 0, 255],[31, 31, 0, 255],[0, 47, 0, 255],[0, 0, 255, 255]],
          [[49, 0, 127, 255],[16, 16, 127, 255],[0, 24, 127, 255],[0, 0, 255, 255]],
          [[175, 0, 0, 255],[144, 144, 0, 255],[0, 88, 0, 255],[0, 0, 255, 255]],
          [[116, 0, 84, 191],[96, 96, 84, 191],[0, 58, 84, 191],[0, 0, 255, 191]]
   ],
   ['luminosity',
          [[55, 55, 255, 255],[224, 224, 255, 255],[54, 54, 255, 255],[0, 0, 255, 255]],
          [[28, 28, 255, 255],[112, 112, 255, 255],[27, 27, 255, 255],[0, 0, 255, 255]],
@@ skipping 47 matching lines @@
           
           checkBlendModeResult(blendModes[i][0], testScenario[j][0], blendModes[i][j+1], sigma);
           ctx.restore();                                  
           }
         debug('');
         }
   }
 
 // Run test and allow variation of results.
 prepareTestScenario(5);