Last round of fixes and refactorings regarding resize issues
and the Canvas component:
* Consolidate all the width calculation logic inside the Canvas component
* Consolidate image resizing logic in the Canvas component
* Fix size problem with SVG images
* Clean up comments and tests
Change-Id: I0198cc1e3a45f7287b9a7494f73a8f158303f886
Bug: 56454
Mingle: 239
A simple task queue which can be processed or cancelled.
Will be used to handle preloading in a more robust way.
Change-Id: Ib33f9b2d814a35538f9d4f3691fce5ba5cdc82c1