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diff --git a/layout/reftests/webm-video/generate-object-fit-video-tests.sh b/layout/reftests/webm-video/generate-object-fit-video-tests.sh
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+++ b/layout/reftests/webm-video/generate-object-fit-video-tests.sh
@@ -0,0 +1,87 @@
+#!/bin/bash
+#
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+#
+# Script to generate <video src> reftest files, from corresponding reftest
+# files that use <video poster>.
+#
+# This script expects to be run from this working directory:
+#  mozilla-central/layout/reftests/w3c-css/submitted/images3
+#
+# It requires that the tools png2yuv and vpxenc be available, from the
+# Ubuntu packages 'mjpegtools' and 'vpx-tools'. More info here:
+#  http://wiki.webmproject.org/howtos/convert-png-frames-to-webm-video
+
+VIDEO_REFTEST_PATH="../../../webm-video"
+
+imageFileArr=("colors-16x8.png" "colors-8x16.png")
+numImageFiles=${#imageFileArr[@]}
+
+# Copy image files, and generate webm files:
+for ((i = 0; i < $numImageFiles; i++)); do
+  imageFileName=${imageFileArr[$i]}
+  imageDest=$VIDEO_REFTEST_PATH/$imageFileName
+
+  echo "Copying $imageDest."
+  hg cp support/$imageFileName $imageDest
+
+  videoDest=`echo $imageDest | sed "s/png/webm/"`
+  echo "Generating $videoDest."
+  png2yuv -f 1 -I p -b 1 -n 1 -j $imageDest \
+    | vpxenc --passes=1 --pass=1 --codec=vp9 --lossless=1 --max-q=0 -o $videoDest -
+  hg add $videoDest
+done
+
+# Add comment & default-preferences line to reftest.list in dest directory:
+reftestListFileName="$VIDEO_REFTEST_PATH/reftest.list"
+echo "
+# Tests for <video src> with 'object-fit' & 'object-position':
+# These tests should be very similar to tests in our w3c-css/submitted/images3
+# reftest directory. They live here because they use WebM video (VP9), and it
+# wouldn't be fair of us to make a W3C testsuite implicitly depend on any
+# particular (non-spec-mandated) video codec.
+default-preferences test-pref(layout.css.object-fit-and-position.enabled,true)"\
+  >> $reftestListFileName
+
+# Loop across all <video poster> tests:
+for origTestName in object*p.html; do
+  # Find the corresponding reference case:
+  origReferenceName=$(echo $origTestName |
+                      sed "s/p.html/-ref.html/")
+
+  # The generated testcase will have "-webm" instead of "-png", and unlike
+  # the original png test, it won't have a single-letter suffix to indicate the
+  # particular container element. (since it's unnecessary -- there's only one
+  # possible container element for webm, "<video>")
+  videoTestName=$(echo $origTestName |
+                  sed "s/png/webm/" |
+                  sed "s/p.html/.html/")
+
+  videoReferenceName=$(echo $videoTestName |
+                       sed "s/.html/-ref.html/")
+
+  # Generate reference file (dropping "support" subdir from image paths):
+  echo "Copying $origReferenceName to $VIDEO_REFTEST_PATH."
+  videoReferenceFullPath=$VIDEO_REFTEST_PATH/$videoReferenceName
+  hg cp $origReferenceName $videoReferenceFullPath
+  sed -i "s,support/,," $videoReferenceFullPath
+
+  # Generate testcase
+  # (converting <video poster="support/foo.png"> to <video src="foo.webm">):
+  echo "Generating $videoTestName from $origTestName."
+  videoTestFullPath=$VIDEO_REFTEST_PATH/$videoTestName
+  hg cp $origTestName $videoTestFullPath
+  sed -i "s/PNG image/WebM video/" $videoTestFullPath
+  sed -i "s/poster/src/" $videoTestFullPath
+  sed -i "s,support/,," $videoTestFullPath
+  sed -i "s/png/webm/" $videoTestFullPath
+  sed -i "s/$origReferenceName/$videoReferenceName/" $videoTestFullPath
+
+  # Update reftest manifest:
+  annotation="fails-if(layersGPUAccelerated) skip-if(Android||B2G)"
+  comment="# Bug 1083516 for layersGPUAccelerated failures, Bug 1084564 for Android/B2G failures"
+  echo "$annotation == $videoTestName $videoReferenceName $comment" \
+    >> $reftestListFileName
+
+done