GitLab

Changes include:
(1) HTMLCanvasElement: 

The toBlob function is implemented in a similar fashion as the existing toDataURL function, taking in parameters like mimeType and qualityArgument. It has an additional argument FileCallback which accepts user-defined callback function.

(2) ImageDataBuffer:

encodeImage is made public.

(3) File:

A new create factory method is added to allow HTMLCanvasElement to create a new File object using the blob data. File object is a subtype of Blob object; it has two additional attributes -- name, last modification time -- as compared to Blob. We use empty string and current time to fill in these two attributes; FF creates the latter attribute in the same way.

(4) FileCallback: 

Moved from module/ to core/. 



BUG=67587

Review URL: https://codereview.chromium.org/1257253004

git-svn-id: svn://svn.chromium.org/blink/trunk@201327 bbb929c8-8fbe-4397-9dbb-9b2b20218538