Move and rename RenderBR to LayoutBR.

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

 layer at (0,0) size 800x600 scrollX 3374.00 scrollWidth 4174
   RenderView at (0,0) size 800x600
 layer at (-3374,0) size 4174x600 backgroundClip at (0,0) size 800x600 clip at (0,0) size 800x600 outlineClip at (0,0) size 800x600
   RenderBlock {HTML} at (0,0) size 4174.34x600
     RenderBody {BODY} at (60,48) size 4054.34x504
       RenderBlock {H1} at (0,0) size 48x504
         RenderText {#text} at (6,0) size 36x64
           text run at (6,0) width 64: "\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 3929x504
         RenderBlock (anonymous) at (0,0) size 2216x504
-          RenderBR {BR} at (0,0) size 17x0
-          RenderBR {BR} at (18,0) size 17x0
-          RenderBR {BR} at (36,0) size 17x0
+          LayoutBR {BR} at (0,0) size 17x0
+          LayoutBR {BR} at (18,0) size 17x0
+          LayoutBR {BR} at (36,0) size 17x0
           RenderText {#text} at (54,0) size 17x144
             text run at (54,0) width 144: "\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{3000}\x{4E00}"
-          RenderBR {BR} at (54,144) size 17x0
-          RenderBR {BR} at (72,0) size 17x0
+          LayoutBR {BR} at (54,144) size 17x0
+          LayoutBR {BR} at (72,0) size 17x0
           RenderText {#text} at (101,0) size 17x16
             text run at (101,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 17x35
             LayoutRubyRun (anonymous) at (101,16) size 18x34.25
               LayoutRubyText {RT} at (-12,0) size 12x34.25
                 RenderText {#text} at (0,0) size 12x35
                   text run at (0,0) width 35: "\x{3084}\x{307E}\x{307F}\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 18x34.25
                 RenderInline {RB} at (0,0) size 17x34
                   RenderText {#text} at (0,0) size 17x34
                     text run at (0,0) width 33: "\x{5C71}\x{8DEF}"
           RenderText {#text} at (101,50) size 17x205
             text run at (101,50) width 204: "\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 (101,254) size 17x1
+          LayoutBR {BR} at (101,254) size 17x1
           RenderText {#text} at (130,0) size 17x16
             text run at (130,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 17x16
             LayoutRubyRun (anonymous) at (130,16) size 18x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,4) size 12x9
                   text run at (0,4) width 9: "\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
@@ skipping 48 matching lines @@
             LayoutRubyRun (anonymous) at (130,439.64) size 18x41.25
               LayoutRubyText {RT} at (-12,0) size 12x41.25
                 RenderText {#text} at (0,0) size 12x42
                   text run at (0,0) width 42: "\x{304D}\x{3085}\x{3046}\x{304F}\x{3064}"
               LayoutRubyBase (anonymous) at (0,0) size 18x41.25
                 RenderInline {RB} at (0,0) size 17x37
                   RenderText {#text} at (0,2) size 17x37
                     text run at (0,2) width 36: "\x{7AAE}\x{5C48}"
           RenderText {#text} at (148,0) size 17x243
             text run at (148,0) width 243: "\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 (148,242) size 17x1
+          LayoutBR {BR} at (148,242) size 17x1
           RenderText {#text} at (177,0) size 17x108
             text run at (177,0) width 108: "\x{3000}\x{4F4F}\x{307F}\x{306B}\x{304F}\x{3055}\x{304C}"
           LayoutRuby (inline) {RUBY} at (0,0) size 17x18
             LayoutRubyRun (anonymous) at (177,107.50) size 18x16.81
               LayoutRubyText {RT} at (-12,0) size 12x16.81
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 17: "\x{3053}\x{3046}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16.81
                 RenderInline {RB} at (0,0) size 17x17
                   RenderText {#text} at (0,0) size 17x17
@@ skipping 16 matching lines @@
             LayoutRubyRun (anonymous) at (206,241.97) size 18x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,4) size 12x9
                   text run at (0,4) width 9: "\x{3048}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
                     text run at (0,0) width 16: "\x{753B}"
           RenderText {#text} at (206,257) size 17x81
             text run at (206,257) width 80: "\x{304C}\x{51FA}\x{6765}\x{308B}\x{3002}"
-          RenderBR {BR} at (206,337) size 17x1
+          LayoutBR {BR} at (206,337) size 17x1
           RenderText {#text} at (224,0) size 17x16
             text run at (224,0) width 16: "\x{3000}"
           RenderInline {STRONG} at (0,0) size 17x47
             RenderText {#text} at (224,16) size 17x47
               text run at (224,16) width 47: "\x{4EBA}\x{306E}\x{4E16}"
           RenderText {#text} at (224,62) size 17x416
             text run at (224,62) width 415: "\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 17x41
             LayoutRubyRun (anonymous) at (253,0) size 18x42.61
               LayoutRubyText {RT} at (-12,0) size 12x42.61
@@ skipping 20 matching lines @@
           RenderInline {STRONG} at (0,0) size 17x62
             RenderText {#text} at (289,31) size 17x62
               text run at (289,31) width 62: "\x{4EBA}\x{3067}\x{306A}\x{3057}"
           RenderText {#text} at (289,92) size 17x47
             text run at (289,92) width 46: "\x{306E}\x{56FD}\x{306F}"
           RenderInline {STRONG} at (0,0) size 17x47
             RenderText {#text} at (289,138) size 17x47
               text run at (289,138) width 47: "\x{4EBA}\x{306E}\x{4E16}"
           RenderText {#text} at (289,184) size 17x203
             text run at (289,184) width 202: "\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 (289,386) size 17x1
+          LayoutBR {BR} at (289,386) size 17x1
           RenderText {#text} at (307,0) size 17x477
             text run at (307,0) width 477: "\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 17x34
             LayoutRubyRun (anonymous) at (336,0) size 18x33.30
               LayoutRubyText {RT} at (-12,0) size 12x33.30
                 RenderText {#text} at (0,0) size 12x34
                   text run at (0,0) width 34: "\x{304F}\x{3064}\x{308D}\x{3052}"
               LayoutRubyBase (anonymous) at (0,0) size 18x33.30
                 RenderInline {RB} at (0,0) size 17x33
                   RenderText {#text} at (0,0) size 17x33
@@ skipping 61 matching lines @@
             LayoutRubyRun (anonymous) at (394,340.91) size 18x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,0) size 12x16
                   text run at (0,0) width 16: "\x{305F}\x{3063}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
                     text run at (0,0) width 16: "\x{5C0A}"
           RenderText {#text} at (394,356) size 17x45
             text run at (394,356) width 45: "\x{3068}\x{3044}\x{3002}"
-          RenderBR {BR} at (394,400) size 17x1
+          LayoutBR {BR} at (394,400) size 17x1
           RenderText {#text} at (423,0) size 17x232
             text run at (423,0) width 232: "\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 17x20
             LayoutRubyRun (anonymous) at (423,227.50) size 18x27
               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 18x27
                 RenderInline {RB} at (0,0) size 17x17
                   RenderText {#text} at (0,5) size 17x17
@@ skipping 398 matching lines @@
             LayoutRubyRun (anonymous) at (742,78.44) size 18x33.27
               LayoutRubyText {RT} at (-12,0) size 12x33.27
                 RenderText {#text} at (0,0) size 12x34
                   text run at (0,0) width 34: "\x{3061}\x{3087}\x{3046}\x{3058}"
               LayoutRubyBase (anonymous) at (0,0) size 18x33.27
                 RenderInline {RB} at (0,0) size 17x33
                   RenderText {#text} at (0,0) size 17x33
                     text run at (0,0) width 32: "\x{5BF5}\x{5150}"
           RenderText {#text} at (742,111) size 17x143
             text run at (742,111) width 142: "\x{3088}\x{308A}\x{3082}\x{5E78}\x{798F}\x{3067}\x{3042}\x{308B}\x{3002}"
-          RenderBR {BR} at (742,253) size 17x1
+          LayoutBR {BR} at (742,253) size 17x1
           RenderText {#text} at (771,0) size 17x260
             text run at (771,0) width 260: "\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 17x33
             LayoutRubyRun (anonymous) at (771,259.13) size 18x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,4) size 12x23
                   text run at (0,4) width 23: "\x{304B}\x{3044}"
               LayoutRubyBase (anonymous) at (0,0) size 18x32
                 RenderInline {RB} at (0,0) size 17x32
                   RenderText {#text} at (0,0) size 17x32
@@ skipping 131 matching lines @@
             LayoutRubyRun (anonymous) at (992,0) size 18x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,4) size 12x9
                   text run at (0,4) width 9: "\x{305F}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
                     text run at (0,0) width 16: "\x{8DB3}"
           RenderText {#text} at (992,16) size 17x285
             text run at (992,16) width 285: "\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 (992,300) size 17x1
+          LayoutBR {BR} at (992,300) size 17x1
           RenderText {#text} at (1021,0) size 17x16
             text run at (1021,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 17x16
             LayoutRubyRun (anonymous) at (1021,16) size 18x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,4) size 12x9
                   text run at (0,4) width 9: "\x{3088}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
@@ skipping 172 matching lines @@
             LayoutRubyRun (anonymous) at (1137,74.50) size 18x17.48
               LayoutRubyText {RT} at (-12,0) size 12x17.48
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{306A}\x{3093}"
               LayoutRubyBase (anonymous) at (0,0) size 18x17.48
                 RenderInline {RB} at (0,0) size 17x17
                   RenderText {#text} at (0,0) size 17x17
                     text run at (0,0) width 16: "\x{4F55}"
           RenderText {#text} at (1137,91) size 17x122
             text run at (1137,91) width 121: "\x{306E}\x{4E8B}\x{3082}\x{306A}\x{304B}\x{3063}\x{305F}\x{3002}"
-          RenderBR {BR} at (1137,212) size 17x1
+          LayoutBR {BR} at (1137,212) size 17x1
           RenderText {#text} at (1166,0) size 17x236
             text run at (1166,0) width 236: "\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 17x19
             LayoutRubyRun (anonymous) at (1166,235.94) size 18x17.13
               LayoutRubyText {RT} at (-12,0) size 12x17.13
                 RenderText {#text} at (0,0) size 12x18
                   text run at (0,0) width 18: "\x{307F}\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 18x17.13
                 RenderInline {RB} at (0,0) size 17x17
                   RenderText {#text} at (0,0) size 17x17
@@ skipping 241 matching lines @@
             LayoutRubyRun (anonymous) at (1369,414.75) size 18x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,1) size 12x30
                   text run at (0,1) width 30: "\x{306A}\x{3093}\x{304E}"
               LayoutRubyBase (anonymous) at (0,0) size 18x32
                 RenderInline {RB} at (0,0) size 17x32
                   RenderText {#text} at (0,0) size 17x32
                     text run at (0,0) width 32: "\x{96E3}\x{7FA9}"
           RenderText {#text} at (1369,446) size 17x33
             text run at (1369,446) width 32: "\x{3060}\x{3002}"
-          RenderBR {BR} at (1369,478) size 17x1
+          LayoutBR {BR} at (1369,478) size 17x1
           RenderText {#text} at (1398,0) size 17x205
             text run at (1398,0) width 205: "\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 17x33
             LayoutRubyRun (anonymous) at (1398,204.06) size 18x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,4) size 12x24
                   text run at (0,4) width 24: "\x{3066}\x{307E}"
               LayoutRubyBase (anonymous) at (0,0) size 18x32
                 RenderInline {RB} at (0,0) size 17x32
                   RenderText {#text} at (0,0) size 17x32
@@ skipping 175 matching lines @@
             LayoutRubyRun (anonymous) at (1601,182.88) size 18x35.38
               LayoutRubyText {RT} at (-12,0) size 12x35.38
                 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 18x35.38
                 RenderInline {RB} at (0,0) size 17x34
                   RenderText {#text} at (0,0) size 17x34
                     text run at (0,0) width 33: "\x{4E03}\x{66F2}"
           RenderText {#text} at (1601,217) size 17x89
             text run at (1601,217) width 88: "\x{308A}\x{3078}\x{304B}\x{304B}\x{308B}\x{3002}"
-          RenderBR {BR} at (1601,305) size 17x1
+          LayoutBR {BR} at (1601,305) size 17x1
           RenderText {#text} at (1630,0) size 17x140
             text run at (1630,0) width 140: "\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 17x33
             LayoutRubyRun (anonymous) at (1630,139.63) size 18x32
               LayoutRubyText {RT} at (-12,0) size 12x32
                 RenderText {#text} at (0,1) size 12x30
                   text run at (0,1) width 29: "\x{3072}\x{3070}\x{308A}"
               LayoutRubyBase (anonymous) at (0,0) size 18x32
                 RenderInline {RB} at (0,0) size 17x32
                   RenderText {#text} at (0,0) size 17x32
@@ skipping 111 matching lines @@
               LayoutRubyText {RT} at (-12,0) size 12x17.83
                 RenderText {#text} at (0,0) size 12x19
                   text run at (0,0) width 18: "\x{3046}\x{3061}"
               LayoutRubyBase (anonymous) at (0,0) size 18x17.83
                 RenderInline {RB} at (0,0) size 17x17
                   RenderText {#text} at (0,0) size 17x17
                     text run at (0,0) width 16: "\x{88E1}"
           RenderText {#text} at (1811,459) size 35x490
             text run at (1811,459) width 31: "\x{306B}\x{6B8B}"
             text run at (1829,0) width 139: "\x{308B}\x{306E}\x{304B}\x{3082}\x{77E5}\x{308C}\x{306A}\x{3044}\x{3002}"
-          RenderBR {BR} at (1829,138) size 17x1
+          LayoutBR {BR} at (1829,138) size 17x1
           RenderText {#text} at (1858,0) size 17x16
             text run at (1858,0) width 16: "\x{3000}"
           LayoutRuby (inline) {RUBY} at (0,0) size 17x34
             LayoutRubyRun (anonymous) at (1858,16) size 18x33.41
               LayoutRubyText {RT} at (-12,0) size 12x33.41
                 RenderText {#text} at (0,0) size 12x34
                   text run at (0,0) width 34: "\x{3044}\x{308F}\x{304B}\x{3069}"
               LayoutRubyBase (anonymous) at (0,0) size 18x33.41
                 RenderInline {RB} at (0,0) size 17x33
                   RenderText {#text} at (0,0) size 17x33
@@ 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 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
                     text run at (0,0) width 16: "\x{64E6}"
           RenderText {#text} at (1974,347) size 35x504
             text run at (1974,347) width 157: "\x{308C}\x{9055}\x{3046}\x{3068}\x{304D}\x{306B}\x{3082}\x{5143}\x{6C17}\x{3088}"
             text run at (1992,0) width 227: "\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 (1992,226) size 17x1
+          LayoutBR {BR} at (1992,226) size 17x1
           RenderText {#text} at (2021,0) size 17x190
             text run at (2021,0) width 190: "\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 17x17
             LayoutRubyRun (anonymous) at (2021,189.81) size 18x16
               LayoutRubyText {RT} at (-12,0) size 12x16
                 RenderText {#text} at (0,4) size 12x9
                   text run at (0,4) width 9: "\x{3068}"
               LayoutRubyBase (anonymous) at (0,0) size 18x16
                 RenderInline {RB} at (0,0) size 17x16
                   RenderText {#text} at (0,0) size 17x16
@@ skipping 41 matching lines @@
                 RenderText {#text} at (0,0) size 12x35
                   text run at (0,0) width 35: "\x{306F}\x{3093}\x{305C}\x{3093}"
               LayoutRubyBase (anonymous) at (0,0) size 18x34.50
                 RenderInline {RB} at (0,0) size 17x34
                   RenderText {#text} at (0,0) size 17x34
                     text run at (0,0) width 33: "\x{5224}\x{7136}"
           RenderText {#text} at (2097,0) size 53x495
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