There is a reftest failure when turning on canvas background color. Because we round the bound of the color layer but we don't do rounding for image layer.  layout/reftests/pixel-rounding/rounded-background-color-top-4.html
The patch can fix the reftest failures when using canvas background color layer. I checked the Non-QR try and it looks like the patch doesn't cause new failures.  https://treeherder.mozilla.org/#/jobs?repo=try&revision=bbd891d1bd99d8c3b504d446739e40b2389cd377&selectedJob=101826673
Attachment #8871148 - Flags: review?(matt.woodrow)
Attachment #8871148 - Flags: review?(matt.woodrow) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/5dd47ac3e215 Round the dest rect of the image layer to match the color layer behavior. r=mattwoodrow
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