third_party/WebKit/LayoutTests/fast/canvas/canvas-toBlob-case-insensitive-mimetype.html

<script src = "../../resources/js-test.js"></script>
<script type = "text/javascript"> 
if (window.testRunner)
{
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

description("Test that toBlob(mimeType) ignores the case of 'mimeType'.");

canvas = document.createElement('canvas');
var counter;

function tryMimeType(mimeType, expectedMimeType)
{
    canvas.toBlob(function(blob) {
        if (blob.type === expectedMimeType) {
            testPassed("");
        }
        else {
            testFailed(blob.type + " does not match " + expectedMimeType);
        }
        counter = counter - 1;
        if (window.testRunner) {
            if (counter == 0) {
                testRunner.notifyDone();
            }
        }
    }, mimeType);
}

counter = 4;

//Note that due to the async nature of toBlob, these callbacks may complete
// at random order but they will all print PASS when they pass.
tryMimeType("image/PNG", "image/png");

tryMimeType("imaGE/jpEg", "image/jpeg");

tryMimeType("ImAgE/WeBp", "image/webp");

//Unsupported mime type falls back to png
tryMimeType("image/bmp", "image/png");

</Script>