Always give RenderParts a RenderLayer.

LayoutTests/platform/linux/fast/frames/frameset-style-recalc-expected.txt

Index: LayoutTests/platform/linux/fast/frames/frameset-style-recalc-expected.txt
diff --git a/LayoutTests/platform/linux/fast/frames/frameset-style-recalc-expected.txt b/LayoutTests/platform/linux/fast/frames/frameset-style-recalc-expected.txt
index dfbb2b03b952a53807b0d2f604d32ef7e49a2301..af94fa870b8c11c67de44531fead9563560869c5 100644
--- a/LayoutTests/platform/linux/fast/frames/frameset-style-recalc-expected.txt
+++ b/LayoutTests/platform/linux/fast/frames/frameset-style-recalc-expected.txt
@@ -3,34 +3,36 @@ layer at (0,0) size 800x600
 layer at (0,0) size 800x600
   RenderBlock {HTML} at (0,0) size 800x600
     RenderFrameSet {FRAMESET} at (0,0) size 800x600
-      RenderFrame {FRAME} at (0,0) size 800x200
-        layer at (0,0) size 800x200
-          RenderView at (0,0) size 800x200
-        layer at (0,0) size 800x200
-          RenderBlock {HTML} at (0,0) size 800x200
-            RenderBody {BODY} at (8,8) size 784x176
-              RenderBlock {P} at (0,0) size 784x40
-                RenderText {#text} at (0,0) size 51x19
-                  text run at (0,0) width 51: "Test for "
-                RenderInline {I} at (0,0) size 727x39
-                  RenderInline {A} at (0,0) size 311x19 [color=#0000EE]
-                    RenderText {#text} at (51,0) size 311x19
-                      text run at (51,0) width 311: "https://bugs.webkit.org/show_bug.cgi?id=19348"
-                  RenderText {#text} at (362,0) size 727x39
-                    text run at (362,0) width 4: " "
-                    text run at (366,0) width 361: "REGRESSION (r34193): Setting the size of a frame with"
-                    text run at (0,20) width 69: "javascript "
-                    text run at (69,20) width 235: "document.body.row no longer works"
-                RenderText {#text} at (304,20) size 4x19
-                  text run at (304,20) width 4: "."
-              RenderBlock {P} at (0,56) size 784x20
-                RenderText {#text} at (0,0) size 193x19
-                  text run at (0,0) width 193: "This frame should be 200px tall."
-        layer at (0,100) size 100x100
-          RenderBlock (positioned) {DIV} at (0,100) size 100x100 [bgcolor=#008000]
-      RenderFrame {FRAME} at (0,206) size 800x394
-        layer at (0,0) size 800x394
-          RenderView at (0,0) size 800x394
-        layer at (0,0) size 800x394
-          RenderBlock {HTML} at (0,0) size 800x394
-            RenderBody {BODY} at (8,8) size 784x378
+layer at (0,0) size 800x200
+  RenderFrame {FRAME} at (0,0) size 800x200
+    layer at (0,0) size 800x200
+      RenderView at (0,0) size 800x200
+    layer at (0,0) size 800x200
+      RenderBlock {HTML} at (0,0) size 800x200
+        RenderBody {BODY} at (8,8) size 784x176
+          RenderBlock {P} at (0,0) size 784x40
+            RenderText {#text} at (0,0) size 51x19
+              text run at (0,0) width 51: "Test for "
+            RenderInline {I} at (0,0) size 727x39
+              RenderInline {A} at (0,0) size 311x19 [color=#0000EE]
+                RenderText {#text} at (51,0) size 311x19
+                  text run at (51,0) width 311: "https://bugs.webkit.org/show_bug.cgi?id=19348"
+              RenderText {#text} at (362,0) size 727x39
+                text run at (362,0) width 4: " "
+                text run at (366,0) width 361: "REGRESSION (r34193): Setting the size of a frame with"
+                text run at (0,20) width 69: "javascript "
+                text run at (69,20) width 235: "document.body.row no longer works"
+            RenderText {#text} at (304,20) size 4x19
+              text run at (304,20) width 4: "."
+          RenderBlock {P} at (0,56) size 784x20
+            RenderText {#text} at (0,0) size 193x19
+              text run at (0,0) width 193: "This frame should be 200px tall."
+    layer at (0,100) size 100x100
+      RenderBlock (positioned) {DIV} at (0,100) size 100x100 [bgcolor=#008000]
+layer at (0,206) size 800x394
+  RenderFrame {FRAME} at (0,206) size 800x394
+    layer at (0,0) size 800x394
+      RenderView at (0,0) size 800x394
+    layer at (0,0) size 800x394
+      RenderBlock {HTML} at (0,0) size 800x394
+        RenderBody {BODY} at (8,8) size 784x378