Matteo Ferretti c0ce371e10 Bug 1241867 - override the DPR without affecting the rendering; r=dbaron
- added overrideDPPX to nsIContentViewer
- made CSSStyleSheet and GlobalWindow using the overrideDPPX value
- added unit test with frame check

MozReview-Commit-ID: AOWpGs4vb9H

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extra : rebase_source : 45d9ae2c9b7aad835b5602e805ec7260c69c05b8
2016-08-25 13:15:19 +02:00
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