Re: [2dcontext-tests][html-tests] Rewrite toBlob tests outside the canvas harness. (#4753)

# Chrome (unstable channel) #
Testing web-platform-tests at revision 43640083b015b63cdb75a3e9a24a7f1863397545
Using browser at version 58.0.3000.4 dev
Starting 10 test iterations
All results were stable
## All results ##
<details>
<summary><a href="http://w3c-test.org/submissions/4753/html/semantics/embedded-content/the-canvas-element/toBlob.jpeg.html">/html/semantics/embedded-content/the-canvas-element/toBlob.jpeg.html</a></summary>


|                   Subtest                    | Results |
|----------------------------------------------|---------|
|                                              | OK      |
| `toBlob with image/jpeg returns a JPEG Blob` | PASS    |

</details>
<details>
<summary><a href="http://w3c-test.org/submissions/4753/html/semantics/embedded-content/the-canvas-element/toBlob.png.html">/html/semantics/embedded-content/the-canvas-element/toBlob.png.html</a></summary>


|                  Subtest                   | Results |
|--------------------------------------------|---------|
|                                            | OK      |
| `toBlob with image/png returns a PNG Blob` | PASS    |

</details>

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4753#issuecomment-277997809

Received on Tuesday, 7 February 2017 13:22:33 UTC