[CompositeAfterPaint] Rebaseline several web tests

TBR=pdr@chromium.org

Bug: 524134
Change-Id: Ic612a760cb4ec7ed951b5026e1e0a81d7966a466
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022255Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735451}

third_party/blink/web_tests/FlagExpectations/composite-after-paint

@@ -123,7 +123,6 @@ paint/invalidation/compositing/should-not-repaint-composited-descendants.html [
 # Subpixel or invisible color differences that look benign, but we can't rebaseline ref tests.
 compositing/overflow/ancestor-with-clip-path.html [ Failure ]
 css3/blending/svg-isolation-add-clipper-text.html [ Failure ]
-fast/multicol/mixed-opacity-fixed-test.html [ Failure ]
 fullscreen/rendering/backdrop-object.html [ Failure ]
 external/wpt/svg/render/reftests/blending-001.svg [ Failure ]
 external/wpt/svg/render/reftests/blending-002.svg [ Failure ]

third_party/blink/web_tests/flag-specific/composite-after-paint/compositing/layer-creation/fixed-position-in-fixed-overflow-expected.txt

@@ -6,10 +6,36 @@
       "contentsOpaque": true,
       "backgroundColor": "#FFFFFF"
     },
+    {
+      "name": "VerticalScrollbar",
+      "position": [785, 0],
+      "bounds": [15, 600],
+      "transform": 1
+    },
     {
       "name": "LayoutNGBlockFlow (positioned) DIV class='overflow fixed'",
-      "position": [8, 13],
-      "bounds": [792, 587]
+      "bounds": [100, 1000],
+      "contentsOpaque": true,
+      "backgroundColor": "#0000FF",
+      "transform": 1
+    },
+    {
+      "name": "LayoutNGBlockFlow (positioned) DIV class='yellow fixed'",
+      "position": [200, 13],
+      "bounds": [100, 100],
+      "contentsOpaque": true,
+      "backgroundColor": "#FFFF00"
+    }
+  ],
+  "transforms": [
+    {
+      "id": 1,
+      "transform": [
+        [1, 0, 0, 0],
+        [0, 1, 0, 0],
+        [0, 0, 1, 0],
+        [8, 13, 0, 1]
+      ]
     }
   ]
 }

third_party/blink/web_tests/flag-specific/composite-after-paint/paint/invalidation/scroll/caret-with-composited-scroll-expected.txt

@@ -13,12 +13,12 @@
       "paintInvalidations": [
         {
           "object": "LayoutTextControl INPUT id='text'",
-          "rect": [0, 999, 205, 23],
+          "rect": [0, 998, 205, 24],
           "reason": "subtree"
         },
         {
           "object": "LayoutTextControl INPUT id='text'",
-          "rect": [0, 999, 205, 23],
+          "rect": [0, 998, 205, 24],
           "reason": "chunk appeared"
         },
         {

third_party/blink/web_tests/flag-specific/composite-after-paint/paint/invalidation/svg/scrolling-embedded-svg-file-image-repaint-problem-expected.txt

@@ -18,7 +18,7 @@
         },
         {
           "object": "NGPhysicalBoxFragment LayoutInline A",
-          "rect": [380, 968, 48, 27],
+          "rect": [382, 970, 44, 23],
           "reason": "appeared"
         },
         {