Avoid requiring a recalc to update compositing state for iframes

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

Index: LayoutTests/platform/mac/tables/mozilla/bugs/bug38916-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/bugs/bug38916-expected.txt b/LayoutTests/platform/mac/tables/mozilla/bugs/bug38916-expected.txt
index 1d7f4aff456a840cacae1fa883964162bb09247d..b577814a0f922e898864c09c229ba398906cb9bc 100644
--- a/LayoutTests/platform/mac/tables/mozilla/bugs/bug38916-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/bugs/bug38916-expected.txt
@@ -30,12 +30,6 @@ layer at (0,0) size 785x1368
                 text run at (2,2) width 12: "A"
                 text run at (2,20) width 26: "Cell"
             RenderTableCell {TD} at (44,0) size 678x204 [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 (724,82) size 41x40 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 26x36
@@ -100,12 +94,6 @@ layer at (0,0) size 785x1368
                 text run at (2,2) width 12: "A"
                 text run at (2,20) width 26: "Cell"
             RenderTableCell {TD} at (45,0) size 676x204 [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 (723,82) size 42x40 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 26x36
@@ -122,12 +110,6 @@ layer at (0,0) size 785x1368
                 text run at (2,2) width 12: "A"
                 text run at (2,20) width 26: "Cell"
             RenderTableCell {TD} at (44,2) size 678x204 [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 (724,84) size 41x40 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 26x36
@@ -165,3 +147,24 @@ layer at (0,0) size 785x1368
               RenderText {#text} at (2,2) size 26x36
                 text run at (2,2) width 12: "A"
                 text run at (2,20) width 26: "Cell"
+layer at (65,253) 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 (66,611) 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 (65,969) 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