Merge pull request #1707 from tschneidereit/master

[Bug 1066566] Fix inspector's "Open File" functionality
Hack to wait for Chrome to load fonts
Merge pull request #1708 from yurydelendik/chromefont

Hack to wait for Chrome to load fonts
Ref images viewer
Bug 1067190 - Part1: Expose function for creating SVGMatrix instances in GFX land
Bug 1067190 - Part 2: Use identity matrix for gradients with singular transform matrix
Warn about dropped tags in defineSymbol parsing

Turns out we silently swallow nested symbols, which we would've found out much earlier with such a warning.
Merge pull request #1715 from tschneidereit/parser

Warn about dropped tags in defineSymbol parsing
Bug 1063786 - Support nested symbol definitions in the SWF parser
Merge pull request #1714 from tschneidereit/inverse-matrix

Bug 1067190 - Handle singular gradient transform matrices in the GFX backend
Merge pull request #1716 from tschneidereit/parser

Bug 1063786 - Support nested symbol definitions in the SWF parser. r=tobytailor
Don't include tag.id in warning about dropped tags: since we now handle nested symbols, the id can never be anything but undefined at this point.
Warn about dropped tags in one more place