[New Multicolumn] Add support for column-span:all

LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/span/span-as-nested-inline-block-child-expected.txt

Index: LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/span/span-as-nested-inline-block-child-expected.txt
diff --git a/LayoutTests/platform/linux/fast/multicol/span/span-as-nested-inline-block-child-expected.txt b/LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/span/span-as-nested-inline-block-child-expected.txt
similarity index 54%
copy from LayoutTests/platform/linux/fast/multicol/span/span-as-nested-inline-block-child-expected.txt
copy to LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/span/span-as-nested-inline-block-child-expected.txt
index 4aaebdc7a5c5317577f4460aac6517d3a351dbe9..410ea91883fef602af16bace2f91cd85c3661853 100644
--- a/LayoutTests/platform/linux/fast/multicol/span/span-as-nested-inline-block-child-expected.txt
+++ b/LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/span/span-as-nested-inline-block-child-expected.txt
@@ -1,10 +1,13 @@
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
-layer at (0,0) size 800x120
-  RenderBlock {HTML} at (0,0) size 800x120
-    RenderBody {BODY} at (8,8) size 784x104
-layer at (8,8) size 784x104
-  RenderBlock {DIV} at (0,0) size 784x104
+layer at (0,0) size 800x116
+  RenderBlock {HTML} at (0,0) size 800x116
+    RenderBody {BODY} at (8,8) size 784x100
+layer at (8,8) size 784x100
+  RenderBlock {DIV} at (0,0) size 784x100
+    RenderMultiColumnSet at (0,0) size 784x100
+layer at (8,8) size 384x200
+  RenderMultiColumnFlowThread at (0,0) size 384x200
     RenderBlock {DIV} at (0,0) size 374x88
       RenderBlock {P} at (0,16) size 374x20
         RenderText {#text} at (0,0) size 317x19
@@ -14,10 +17,10 @@ layer at (8,8) size 784x104
           text run at (0,0) width 374: "This text should be below the previous text, but still on the left."
     RenderText {#text} at (0,0) size 0x0
     RenderInline {SPAN} at (0,0) size 376x99
-      RenderText {#text} at (0,104) size 376x99
-        text run at (0,104) width 347: "The beginning of this text should start next to or below the"
-        text run at (0,124) width 376: "previous text, and still in the left column. However, when made"
-        text run at (0,144) width 374: "sufficiently longer than the previous block of text, it should spill"
-        text run at (0,164) width 372: "into the right column instead of staying below the block before"
-        text run at (0,184) width 11: "it."
+      RenderText {#text} at (0,100) size 376x99
+        text run at (0,100) width 347: "The beginning of this text should start next to or below the"
+        text run at (0,120) width 376: "previous text, and still in the left column. However, when made"
+        text run at (0,140) width 374: "sufficiently longer than the previous block of text, it should spill"
+        text run at (0,160) width 372: "into the right column instead of staying below the block before"
+        text run at (0,180) width 11: "it."
     RenderText {#text} at (0,0) size 0x0