Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/writing-mode/Kusa-Makura-background-canvas-expected.txt

 layer at (0,0) size 800x600 scrollX 3800.00 scrollWidth 4600
   RenderView at (0,0) size 800x600
 layer at (-3800,0) size 4600x600 backgroundClip at (0,0) size 800x600 clip at (0,0) size 800x600 outlineClip at (0,0) size 800x600
   RenderBlock {HTML} at (0,0) size 4600.34x600
     RenderBody {BODY} at (60,48) size 4480.34x504
       RenderBlock {H1} at (0,0) size 48x504
         RenderText {#text} at (6,0) size 36x66
           text run at (6,0) width 66: "\x{8349}\x{6795}"
       RenderBlock {H2} at (69.44,0) size 36x504
         RenderText {#text} at (5,0) size 26x96
           text run at (5,0) width 96: "\x{590F}\x{76EE}\x{6F31}\x{77F3}"
       RenderBlock {DIV} at (125.34,0) size 4355x504
         RenderBlock (anonymous) at (0,0) size 2468x504
-          RenderBR {BR} at (0,0) size 19x0
-          RenderBR {BR} at (20,0) size 19x0
-          RenderBR {BR} at (40,0) size 19x0
+          LayoutBR {BR} at (0,0) size 19x0
+          LayoutBR {BR} at (20,0) size 19x0
+          LayoutBR {BR} at (40,0) size 19x0
           RenderText {#text} at (60,0) size 19x144
             text run at (60,0) width 144: "\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{4E00}"
-          RenderBR {BR} at (60,144) size 19x0
-          RenderBR {BR} at (80,0) size 19x0
+          LayoutBR {BR} at (60,144) size 19x0
+          LayoutBR {BR} at (80,0) size 19x0
           RenderText {#text} at (111,0) size 19x16
             text run at (111,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x34
             LayoutRubyRun (anonymous) at (111,15) size 20x36
               LayoutRubyText {RT} at (-12,0) size 12x36
                 RenderText {#text} at (0,0) size 12x36
                   text run at (0,0) width 36: "\x{3084}\x{307E}\x{307F}\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 20x36
                 RenderInline {RB} at (0,0) size 19x34
                   RenderText {#text} at (0,1) size 19x34
                     text run at (0,1) width 34: "\x{5C71}\x{8DEF}"
           RenderText {#text} at (111,50) size 19x208
             text run at (111,50) width 208: "\x{3092}\x{767B}\x{308A}\x{306A}\x{304C}\x{3089}\x{3001}\x{3053}\x{3046}\x{8003}\x{3048}\x{305F}\x{3002}"
-          RenderBR {BR} at (111,258) size 19x0
+          LayoutBR {BR} at (111,258) size 19x0
           RenderText {#text} at (142,0) size 19x16
             text run at (142,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x16
             LayoutRubyRun (anonymous) at (142,16) size 20x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,3) size 12x10
                   text run at (0,3) width 9: "\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 20x16
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,0) size 19x16
@@ skipping 48 matching lines @@
             LayoutRubyRun (anonymous) at (142,448) size 20x45
               LayoutRubyText {RT} at (-12,0) size 12x45
                 RenderText {#text} at (0,0) size 12x45
                   text run at (0,0) width 45: "\x{304D}\x{3085}\x{3046}\x{304F}\x{3064}"
               LayoutRubyBase (anonymous) at (0,0) size 20x45
                 RenderInline {RB} at (0,0) size 19x39
                   RenderText {#text} at (0,3) size 19x39
                     text run at (0,3) width 38: "\x{7AAE}\x{5C48}"
           RenderText {#text} at (162,0) size 19x256
             text run at (162,0) width 256: "\x{3060}\x{3002}\x{3068}\x{304B}\x{304F}\x{306B}\x{4EBA}\x{306E}\x{4E16}\x{306F}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{3044}\x{3002}"
-          RenderBR {BR} at (162,256) size 19x0
+          LayoutBR {BR} at (162,256) size 19x0
           RenderText {#text} at (193,0) size 19x112
             text run at (193,0) width 112: "\x{3000}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{3055}\x{304C}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x16
             LayoutRubyRun (anonymous) at (193,111) size 20x18
               LayoutRubyText {RT} at (-12,0) size 12x18
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{3053}\x{3046}"
               LayoutRubyBase (anonymous) at (0,0) size 20x18
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,1) size 19x16
@@ skipping 16 matching lines @@
             LayoutRubyRun (anonymous) at (224,288) size 20x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,3) size 12x10
                   text run at (0,3) width 9: "\x{3048}"
               LayoutRubyBase (anonymous) at (0,0) size 20x16
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,0) size 19x16
                     text run at (0,0) width 16: "\x{753B}"
           RenderText {#text} at (224,304) size 19x80
             text run at (224,304) width 80: "\x{304C}\x{51FA}\x{6765}\x{308B}\x{3002}"
-          RenderBR {BR} at (224,384) size 19x0
+          LayoutBR {BR} at (224,384) size 19x0
           RenderText {#text} at (244,0) size 19x16
             text run at (244,0) width 16: "\x{3000}"
           RenderInline {STRONG} at (0,0) size 19x48
             RenderText {#text} at (244,16) size 19x48
               text run at (244,16) width 48: "\x{4EBA}\x{306E}\x{4E16}"
           RenderText {#text} at (244,64) size 19x432
             text run at (244,64) width 432: "\x{3092}\x{4F5C}\x{3063}\x{305F}\x{3082}\x{306E}\x{306F}\x{795E}\x{3067}\x{3082}\x{306A}\x{3051}\x{308C}\x{3070}\x{9B3C}\x{3067}\x{3082}\x{306A}\x{3044}\x{3002}\x{3084}\x{306F}\x{308A}\x{5411}\x{3046}\x{4E09}\x{8ED2}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x42
             LayoutRubyRun (anonymous) at (275,0) size 20x45
               LayoutRubyText {RT} at (-12,0) size 12x45
@@ skipping 20 matching lines @@
           RenderInline {STRONG} at (0,0) size 19x64
             RenderText {#text} at (315,80) size 19x64
               text run at (315,80) width 64: "\x{4EBA}\x{3067}\x{306A}\x{3057}"
           RenderText {#text} at (315,144) size 19x48
             text run at (315,144) width 48: "\x{306E}\x{56FD}\x{306F}"
           RenderInline {STRONG} at (0,0) size 19x48
             RenderText {#text} at (315,192) size 19x48
               text run at (315,192) width 48: "\x{4EBA}\x{306E}\x{4E16}"
           RenderText {#text} at (315,240) size 19x208
             text run at (315,240) width 208: "\x{3088}\x{308A}\x{3082}\x{306A}\x{304A}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{304B}\x{308D}\x{3046}\x{3002}"
-          RenderBR {BR} at (315,448) size 19x0
+          LayoutBR {BR} at (315,448) size 19x0
           RenderText {#text} at (335,0) size 19x496
             text run at (335,0) width 496: "\x{3000}\x{8D8A}\x{3059}\x{4E8B}\x{306E}\x{306A}\x{3089}\x{306C}\x{4E16}\x{304C}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{3051}\x{308C}\x{3070}\x{3001}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{3044}\x{6240}\x{3092}\x{3069}\x{308C}\x{307B}\x{3069}\x{304B}\x{3001}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x35
             LayoutRubyRun (anonymous) at (366,0) size 20x36
               LayoutRubyText {RT} at (-12,0) size 12x36
                 RenderText {#text} at (0,0) size 12x36
                   text run at (0,0) width 36: "\x{304F}\x{3064}\x{308D}\x{3052}"
               LayoutRubyBase (anonymous) at (0,0) size 20x36
                 RenderInline {RB} at (0,0) size 19x34
                   RenderText {#text} at (0,1) size 19x34
@@ skipping 61 matching lines @@
             LayoutRubyRun (anonymous) at (428,383) size 20x18
               LayoutRubyText {RT} at (-12,0) size 12x18
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{305F}\x{3063}"
               LayoutRubyBase (anonymous) at (0,0) size 20x18
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,1) size 19x16
                     text run at (0,1) width 16: "\x{5C0A}"
           RenderText {#text} at (428,400) size 19x48
             text run at (428,400) width 48: "\x{3068}\x{3044}\x{3002}"
-          RenderBR {BR} at (428,448) size 19x0
+          LayoutBR {BR} at (428,448) size 19x0
           RenderText {#text} at (459,0) size 19x240
             text run at (459,0) width 240: "\x{3000}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{304D}\x{4E16}\x{304B}\x{3089}\x{3001}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{304D}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x19
             LayoutRubyRun (anonymous) at (459,236) size 20x27
               LayoutRubyText {RT} at (-12,0) size 12x27
                 RenderText {#text} at (0,0) size 12x27
                   text run at (0,0) width 27: "\x{308F}\x{305A}\x{3089}"
               LayoutRubyBase (anonymous) at (0,0) size 20x27
                 RenderInline {RB} at (0,0) size 19x17
                   RenderText {#text} at (0,5) size 19x17
@@ skipping 400 matching lines @@
               LayoutRubyText {RT} at (-12,0) size 12x36
                 RenderText {#text} at (0,0) size 12x36
                   text run at (0,0) width 36: "\x{3061}\x{3087}\x{3046}\x{3058}"
               LayoutRubyBase (anonymous) at (0,0) size 20x36
                 RenderInline {RB} at (0,0) size 19x34
                   RenderText {#text} at (0,1) size 19x34
                     text run at (0,1) width 34: "\x{5BF5}\x{5150}"
           RenderText {#text} at (800,361) size 39x473
             text run at (800,361) width 112: "\x{3088}\x{308A}\x{3082}\x{5E78}\x{798F}\x{3067}\x{3042}"
             text run at (820,0) width 32: "\x{308B}\x{3002}"
-          RenderBR {BR} at (820,32) size 19x0
+          LayoutBR {BR} at (820,32) size 19x0
           RenderText {#text} at (851,0) size 19x272
             text run at (851,0) width 272: "\x{3000}\x{4E16}\x{306B}\x{4F4F}\x{3080}\x{3053}\x{3068}\x{4E8C}\x{5341}\x{5E74}\x{306B}\x{3057}\x{3066}\x{3001}\x{4F4F}\x{3080}\x{306B}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x32
             LayoutRubyRun (anonymous) at (851,272) size 20x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,3) size 12x26
                   text run at (0,3) width 25: "\x{304B}\x{3044}"
               LayoutRubyBase (anonymous) at (0,0) size 20x32
                 RenderInline {RB} at (0,0) size 19x32
                   RenderText {#text} at (0,0) size 19x32
@@ skipping 133 matching lines @@
             LayoutRubyRun (anonymous) at (1099,160) size 20x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,3) size 12x10
                   text run at (0,3) width 9: "\x{305F}"
               LayoutRubyBase (anonymous) at (0,0) size 20x16
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,0) size 19x16
                     text run at (0,0) width 16: "\x{8DB3}"
           RenderText {#text} at (1099,176) size 19x288
             text run at (1099,176) width 288: "\x{3089}\x{306C}\x{3002}\x{5B58}\x{5206}\x{98DF}\x{3048}\x{3070}\x{3042}\x{3068}\x{304C}\x{4E0D}\x{6109}\x{5FEB}\x{3060}\x{3002}\x{2026}\x{2026}"
-          RenderBR {BR} at (1099,464) size 19x0
+          LayoutBR {BR} at (1099,464) size 19x0
           RenderText {#text} at (1130,0) size 19x16
             text run at (1130,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x16
             LayoutRubyRun (anonymous) at (1130,16) size 20x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,3) size 12x10
                   text run at (0,3) width 9: "\x{3088}"
               LayoutRubyBase (anonymous) at (0,0) size 20x16
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,0) size 19x16
@@ skipping 172 matching lines @@
             LayoutRubyRun (anonymous) at (1254,143) size 20x18
               LayoutRubyText {RT} at (-12,0) size 12x18
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{306A}\x{3093}"
               LayoutRubyBase (anonymous) at (0,0) size 20x18
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,1) size 19x16
                     text run at (0,1) width 16: "\x{4F55}"
           RenderText {#text} at (1254,160) size 19x128
             text run at (1254,160) width 128: "\x{306E}\x{4E8B}\x{3082}\x{306A}\x{304B}\x{3063}\x{305F}\x{3002}"
-          RenderBR {BR} at (1254,288) size 19x0
+          LayoutBR {BR} at (1254,288) size 19x0
           RenderText {#text} at (1285,0) size 19x240
             text run at (1285,0) width 240: "\x{3000}\x{7ACB}\x{3061}\x{4E0A}\x{304C}\x{308B}\x{6642}\x{306B}\x{5411}\x{3046}\x{3092}\x{898B}\x{308B}\x{3068}\x{3001}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x16
             LayoutRubyRun (anonymous) at (1285,239) size 20x18
               LayoutRubyText {RT} at (-12,0) size 12x18
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{307F}\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 20x18
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,1) size 19x16
@@ skipping 240 matching lines @@
             LayoutRubyRun (anonymous) at (1533,48) size 20x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,0) size 12x31
                   text run at (0,0) width 30: "\x{306A}\x{3093}\x{304E}"
               LayoutRubyBase (anonymous) at (0,0) size 20x32
                 RenderInline {RB} at (0,0) size 19x32
                   RenderText {#text} at (0,0) size 19x32
                     text run at (0,0) width 32: "\x{96E3}\x{7FA9}"
           RenderText {#text} at (1533,80) size 19x32
             text run at (1533,80) width 32: "\x{3060}\x{3002}"
-          RenderBR {BR} at (1533,112) size 19x0
+          LayoutBR {BR} at (1533,112) size 19x0
           RenderText {#text} at (1564,0) size 19x208
             text run at (1564,0) width 208: "\x{3000}\x{571F}\x{3092}\x{306A}\x{3089}\x{3059}\x{3060}\x{3051}\x{306A}\x{3089}\x{3055}\x{307B}\x{3069}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x32
             LayoutRubyRun (anonymous) at (1564,208) size 20x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,3) size 12x26
                   text run at (0,3) width 25: "\x{3066}\x{307E}"
               LayoutRubyBase (anonymous) at (0,0) size 20x32
                 RenderInline {RB} at (0,0) size 19x32
                   RenderText {#text} at (0,0) size 19x32
@@ skipping 174 matching lines @@
             LayoutRubyRun (anonymous) at (1781,272) size 20x36
               LayoutRubyText {RT} at (-12,0) size 12x36
                 RenderText {#text} at (0,0) size 12x36
                   text run at (0,0) width 36: "\x{306A}\x{306A}\x{307E}\x{304C}"
               LayoutRubyBase (anonymous) at (0,0) size 20x36
                 RenderInline {RB} at (0,0) size 19x34
                   RenderText {#text} at (0,1) size 19x34
                     text run at (0,1) width 34: "\x{4E03}\x{66F2}"
           RenderText {#text} at (1781,307) size 19x96
             text run at (1781,307) width 96: "\x{308A}\x{3078}\x{304B}\x{304B}\x{308B}\x{3002}"
-          RenderBR {BR} at (1781,403) size 19x0
+          LayoutBR {BR} at (1781,403) size 19x0
           RenderText {#text} at (1812,0) size 19x144
             text run at (1812,0) width 144: "\x{3000}\x{305F}\x{3061}\x{307E}\x{3061}\x{8DB3}\x{306E}\x{4E0B}\x{3067}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x32
             LayoutRubyRun (anonymous) at (1812,144) size 20x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,0) size 12x31
                   text run at (0,0) width 30: "\x{3072}\x{3070}\x{308A}"
               LayoutRubyBase (anonymous) at (0,0) size 20x32
                 RenderInline {RB} at (0,0) size 19x32
                   RenderText {#text} at (0,0) size 19x32
@@ skipping 110 matching lines @@
             LayoutRubyRun (anonymous) at (2038,79) size 20x18
               LayoutRubyText {RT} at (-12,0) size 12x18
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{3046}\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 20x18
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,1) size 19x16
                     text run at (0,1) width 16: "\x{88E1}"
           RenderText {#text} at (2038,96) size 19x176
             text run at (2038,96) width 176: "\x{306B}\x{6B8B}\x{308B}\x{306E}\x{304B}\x{3082}\x{77E5}\x{308C}\x{306A}\x{3044}\x{3002}"
-          RenderBR {BR} at (2038,272) size 19x0
+          LayoutBR {BR} at (2038,272) size 19x0
           RenderText {#text} at (2069,0) size 19x16
             text run at (2069,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x34
             LayoutRubyRun (anonymous) at (2069,15) size 20x36
               LayoutRubyText {RT} at (-12,0) size 12x36
                 RenderText {#text} at (0,0) size 12x36
                   text run at (0,0) width 36: "\x{3044}\x{308F}\x{304B}\x{3069}"
               LayoutRubyBase (anonymous) at (0,0) size 20x36
                 RenderInline {RB} at (0,0) size 19x34
                   RenderText {#text} at (0,1) size 19x34
@@ skipping 97 matching lines @@
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,3) size 12x10
                   text run at (0,3) width 9: "\x{3059}"
               LayoutRubyBase (anonymous) at (0,0) size 20x16
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,0) size 19x16
                     text run at (0,0) width 16: "\x{64E6}"
           RenderText {#text} at (2193,416) size 39x496
             text run at (2193,416) width 80: "\x{308C}\x{9055}\x{3046}\x{3068}\x{304D}"
             text run at (2213,0) width 320: "\x{306B}\x{3082}\x{5143}\x{6C17}\x{3088}\x{304F}\x{9CF4}\x{304D}\x{3064}\x{3065}\x{3051}\x{308B}\x{3060}\x{308D}\x{3046}\x{3068}\x{601D}\x{3063}\x{305F}\x{3002}"
-          RenderBR {BR} at (2213,320) size 19x0
+          LayoutBR {BR} at (2213,320) size 19x0
           RenderText {#text} at (2244,0) size 19x192
             text run at (2244,0) width 192: "\x{3000}\x{6625}\x{306F}\x{7720}\x{304F}\x{306A}\x{308B}\x{3002}\x{732B}\x{306F}\x{9F20}\x{3092}"
           LayoutRuby (inline) {RUBY} at (0,0) size 19x16
             LayoutRubyRun (anonymous) at (2244,192) size 20x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,3) size 12x10
                   text run at (0,3) width 9: "\x{3068}"
               LayoutRubyBase (anonymous) at (0,0) size 20x16
                 RenderInline {RB} at (0,0) size 19x16
                   RenderText {#text} at (0,0) size 19x16
@@ skipping 41 matching lines @@
                 RenderText {#text} at (0,0) size 12x36
                   text run at (0,0) width 36: "\x{306F}\x{3093}\x{305C}\x{3093}"
               LayoutRubyBase (anonymous) at (0,0) size 20x36
                 RenderInline {RB} at (0,0) size 19x34
                   RenderText {#text} at (0,1) size 19x34
                     text run at (0,1) width 34: "\x{5224}\x{7136}"
           RenderText {#text} at (2337,35) size 59x499
             text run at (2337,35) width 464: "\x{3059}\x{308B}\x{3002}\x{96F2}\x{96C0}\x{306E}\x{9CF4}\x{304F}\x{306E}\x{306F}\x{53E3}\x{3067}\x{9CF4}\x{304F}\x{306E}\x{3067}\x{306F}\x{306A}\x{3044}\x{3001}\x{9B42}\x{5168}\x{4F53}\x{304C}\x{9CF4}\x{304F}\x{306E}\x{3060}\x{3002}"
             text run at (2357,0) width 496: "\x{9B42}\x{306E}\x{6D3B}\x{52D5}\x{304C}\x{58F0}\x{306B}\x{3042}\x{3089}\x{308F}\x{308C}\x{305F}\x{3082}\x{306E}\x{306E}\x{3046}\x{3061}\x{3067}\x{3001}\x{3042}\x{308C}\x{307B}\x{3069}\x{5143}\x{6C17}\x{306E}\x{3042}\x{308B}\x{3082}\x{306E}\x{306F}"
             text run at (2377,0) width 464: "\x{306A}\x{3044}\x{3002}\x{3042}\x{3042}\x{6109}\x{5FEB}\x{3060}\x{3002}\x{3053}\x{3046}\x{601D}\x{3063}\x{3066}\x{3001}\x{3053}\x{3046}\x{6109}\x{5FEB}\x{306B}\x{306A}\x{308B}\x{306E}\x{304C}\x{8A69}\x{3067}\x{3042}\x{308B}\x{3002}"
-          RenderBR {BR} at (2377,464) size 19x0
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