Avoid requiring a recalc to update compositing state for iframes

LayoutTests/platform/win/tables/mozilla/bugs/bug38916-expected.txt

Index: LayoutTests/platform/win/tables/mozilla/bugs/bug38916-expected.txt
diff --git a/LayoutTests/platform/win/tables/mozilla/bugs/bug38916-expected.txt b/LayoutTests/platform/win/tables/mozilla/bugs/bug38916-expected.txt
index 0a69f14edb1635b16ff06f9a76c99ec2db56627d..4044f82c6e729aa5a7b4cdbab81cbf800a60e94e 100644
--- a/LayoutTests/platform/win/tables/mozilla/bugs/bug38916-expected.txt
+++ b/LayoutTests/platform/win/tables/mozilla/bugs/bug38916-expected.txt
@@ -30,12 +30,6 @@ layer at (0,0) size 785x1398
                 text run at (2,2) width 11: "A"
                 text run at (2,22) width 24: "Cell"
             RenderTableCell {TD} at (42,0) size 682x204 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
-              RenderPartObject {IFRAME} at (12,12) size 155x180 [border: (5px solid #FF0000)]
-                layer at (0,0) size 125x150
-                  RenderView at (0,0) size 125x150
-                layer at (0,0) size 125x150
-                  RenderBlock {HTML} at (0,0) size 125x150
-                    RenderBody {BODY} at (8,8) size 109x134
               RenderText {#text} at (0,0) size 0x0
             RenderTableCell {TD} at (726,80) size 39x44 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 24x39
@@ -100,12 +94,6 @@ layer at (0,0) size 785x1398
                 text run at (2,2) width 11: "A"
                 text run at (2,22) width 24: "Cell"
             RenderTableCell {TD} at (42,0) size 682x204 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
-              RenderPartObject {IFRAME} at (12,12) size 155x180 [border: (5px solid #FF0000)]
-                layer at (0,0) size 125x150
-                  RenderView at (0,0) size 125x150
-                layer at (0,0) size 125x150
-                  RenderBlock {HTML} at (0,0) size 125x150
-                    RenderBody {BODY} at (8,8) size 109x134
               RenderText {#text} at (0,0) size 0x0
             RenderTableCell {TD} at (726,80) size 39x44 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 24x39
@@ -122,12 +110,6 @@ layer at (0,0) size 785x1398
                 text run at (2,2) width 11: "A"
                 text run at (2,22) width 24: "Cell"
             RenderTableCell {TD} at (42,2) size 682x204 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
-              RenderPartObject {IFRAME} at (12,12) size 155x180 [border: (5px solid #FF0000)]
-                layer at (0,0) size 125x150
-                  RenderView at (0,0) size 125x150
-                layer at (0,0) size 125x150
-                  RenderBlock {HTML} at (0,0) size 125x150
-                    RenderBody {BODY} at (8,8) size 109x134
               RenderText {#text} at (0,0) size 0x0
             RenderTableCell {TD} at (726,82) size 39x44 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 24x39
@@ -165,3 +147,24 @@ layer at (0,0) size 785x1398
               RenderText {#text} at (2,2) size 24x39
                 text run at (2,2) width 11: "A"
                 text run at (2,22) width 24: "Cell"
+layer at (63,263) size 155x180
+  RenderPartObject {IFRAME} at (12,12) size 155x180 [border: (5px solid #FF0000)]
+    layer at (0,0) size 125x150
+      RenderView at (0,0) size 125x150
+    layer at (0,0) size 125x150
+      RenderBlock {HTML} at (0,0) size 125x150
+        RenderBody {BODY} at (8,8) size 109x134
+layer at (63,627) size 155x180
+  RenderPartObject {IFRAME} at (12,12) size 155x180 [border: (5px solid #FF0000)]
+    layer at (0,0) size 125x150
+      RenderView at (0,0) size 125x150
+    layer at (0,0) size 125x150
+      RenderBlock {HTML} at (0,0) size 125x150
+        RenderBody {BODY} at (8,8) size 109x134
+layer at (63,991) size 155x180
+  RenderPartObject {IFRAME} at (12,12) size 155x180 [border: (5px solid #FF0000)]
+    layer at (0,0) size 125x150
+      RenderView at (0,0) size 125x150
+    layer at (0,0) size 125x150
+      RenderBlock {HTML} at (0,0) size 125x150
+        RenderBody {BODY} at (8,8) size 109x134