Add m-esr52 at 52.6.0

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diff --git a/image/test/reftest/downscaling/reftest.list b/image/test/reftest/downscaling/reftest.list
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+# Reftests for downscaling
+#
+# Downscaling can be a lossy process, so a bit of mismatch is acceptable here,
+# as long as it's barely noticable visually. When necessary, this can be
+# explicitly allowed via 'fuzzy'/'fuzzy-if' annotations.
+#
+# Many of these tests check primarily that we don't lose rows or columns of
+# pixels when downscaling by making sure that the result isn't too similar to
+# about:blank. A small amount of fuzziness is used to ensure that the tests
+# don't pass because of very slight deviations; passing tests should be
+# substantially different from about:blank. This fuzziness should *not* be
+# removed as doing so would make the tests pass in situations where they
+# shouldn't.
+#
+# IMPORTANT: For robustness, each test should be listed *twice* in this
+# manifest -- once with the high quality downscaling pref disabled, and once
+# with this pref enabled. The pref is set via "default-preferences", so
+# simply appending a new test to the lists below each of those lines should be
+# sufficient.
+#
+# Also note that Mac OS X has its own system-level downscaling algorithm, so
+# tests here may need Mac-specific "fuzzy-if(cocoaWidget,...)" annotations.
+# Similarly, modern versions of Windows have slightly different downscaling
+# behavior than other platforms, and may require "fuzzy-if(winWidget,...)".
+
+
+# RUN TESTS NOT AFFECTED BY DOWNSCALE-DURING-DECODE:
+# ==================================================
+fuzzy-if(skiaContent,14,416) == downscale-svg-1a.html downscale-svg-1-ref.html?80
+fuzzy(80,468) == downscale-svg-1b.html downscale-svg-1-ref.html?72
+fuzzy-if(skiaContent,8,292) == downscale-svg-1c.html downscale-svg-1-ref.html?64
+fuzzy(17,208) == downscale-svg-1d.html downscale-svg-1-ref.html?53
+fuzzy(78,216) fuzzy-if(skiaContent,110,181) == downscale-svg-1e.html downscale-svg-1-ref.html?40
+fuzzy(51,90) fuzzy-if(skiaContent,142,77) == downscale-svg-1f.html downscale-svg-1-ref.html?24
+
+# RUN TESTS WITH DOWNSCALE-DURING-DECODE DISABLED:
+# ================================================
+default-preferences pref(image.downscale-during-decode.enabled,false)
+
+fuzzy-if(winWidget,16,20) fuzzy-if(cocoaWidget,106,31) == downscale-1.html downscale-1-ref.html
+
+fuzzy(20,999) != downscale-2a.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,left about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,left about:blank
+
+fuzzy(20,999) != downscale-2a.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,right about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,right about:blank
+
+fuzzy(20,999) != downscale-2a.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,top about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,top about:blank
+
+fuzzy(20,999) != downscale-2a.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,bottom about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,bottom about:blank
+fuzzy(20,999) fails-if(OSX>=1008&&!skiaContent) != downscale-2e.html?205,53,bottom about:blank
+
+fuzzy(63,3391) == downscale-moz-icon-1.html downscale-moz-icon-1-ref.html
+
+== downscale-png.html?16,16,interlaced downscale-png.html?16,16,normal
+== downscale-png.html?24,24,interlaced downscale-png.html?24,24,normal
+
+# Non-transparent and transparent ICO images
+== downscale-16px.html?ff-0RGB.ico downscale-16px.html?ff-0RGB.png
+fuzzy(1,1) == downscale-16px.html?ff-ARGB.ico downscale-16px.html?ff-ARGB.png
+
+# Upside-down (negative height) BMP
+== downscale-8px.html?top-to-bottom-16x16-24bpp.bmp downscale-8px.html?bmp-size-16x16-24bpp.png
+
+# Test downscaling from all supported formats from 256 to 32.
+== downscale-32px.html?.bmp downscale-32px-ref.html
+== downscale-32px.html?.gif downscale-32px-ref.html
+fuzzy(1,1024) == downscale-32px.html?.jpg downscale-32px-ref.html
+== downscale-32px.html?.png downscale-32px-ref.html
+== downscale-32px.html?.svg downscale-32px-ref.html
+== downscale-32px.html?-bmp-in.ico downscale-32px-ref.html
+== downscale-32px.html?-png-in.ico downscale-32px-ref.html
+
+# RUN TESTS WITH DOWNSCALE-DURING-DECODE ENABLED:
+# ===============================================
+default-preferences pref(image.downscale-during-decode.enabled,true)
+
+fuzzy(31,127) fuzzy-if(d2d,31,147) == downscale-1.html downscale-1-ref.html # intermittently 147 pixels on win7 accelerated only (not win8)
+
+fuzzy(20,999) != downscale-2a.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,left about:blank
+fuzzy(20,999) != downscale-2f.html?203,52,left about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,left about:blank
+fuzzy(20,999) != downscale-2f.html?205,53,left about:blank
+
+fuzzy(20,999) != downscale-2a.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,right about:blank
+fuzzy(20,999) != downscale-2f.html?203,52,right about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,right about:blank
+fuzzy(20,999) != downscale-2f.html?205,53,right about:blank
+
+fuzzy(20,999) != downscale-2a.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,top about:blank
+fuzzy(20,999) != downscale-2f.html?203,52,top about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,top about:blank
+fuzzy(20,999) != downscale-2f.html?205,53,top about:blank
+
+fuzzy(20,999) != downscale-2a.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2b.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2c.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2d.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2e.html?203,52,bottom about:blank
+fuzzy(20,999) != downscale-2f.html?203,52,bottom about:blank
+
+fuzzy(20,999) != downscale-2a.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2b.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2c.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2d.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2e.html?205,53,bottom about:blank
+fuzzy(20,999) != downscale-2f.html?205,53,bottom about:blank
+
+# Skip on WinXP with skia content
+fuzzy(71,4439) fails-if(/^Windows\x20NT\x205\.1/.test(http.oscpu)) == downscale-moz-icon-1.html downscale-moz-icon-1-ref.html
+
+== downscale-png.html?16,16,interlaced downscale-png.html?16,16,normal
+== downscale-png.html?24,24,interlaced downscale-png.html?24,24,normal
+
+# Non-transparent and transparent ICO images
+fuzzy(1,3) == downscale-16px.html?ff-0RGB.ico downscale-16px.html?ff-0RGB.png
+fuzzy(3,32) == downscale-16px.html?ff-ARGB.ico downscale-16px.html?ff-ARGB.png
+
+# Upside-down (negative height) BMP
+== downscale-8px.html?top-to-bottom-16x16-24bpp.bmp downscale-8px.html?bmp-size-16x16-24bpp.png
+
+# Test downscaling from all supported formats from 256 to 32.
+fuzzy(18,128) == downscale-32px.html?.bmp downscale-32px-ref.html
+fuzzy(18,128) == downscale-32px.html?.gif downscale-32px-ref.html
+fuzzy(19,992) == downscale-32px.html?.jpg downscale-32px-ref.html
+fuzzy(18,128) == downscale-32px.html?.png downscale-32px-ref.html
+== downscale-32px.html?.svg downscale-32px-ref.html
+fuzzy(18,128) == downscale-32px.html?-bmp-in.ico downscale-32px-ref.html
+fuzzy(18,128) == downscale-32px.html?-png-in.ico downscale-32px-ref.html