Support subpixel layout for borders.

third_party/WebKit/LayoutTests/platform/mac/media/video-zoom-expected.txt

Index: third_party/WebKit/LayoutTests/platform/mac/media/video-zoom-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/mac/media/video-zoom-expected.txt b/third_party/WebKit/LayoutTests/platform/mac/media/video-zoom-expected.txt
index 922370b946fb2d2f995ad556c23809777c4d7372..da51e0d208ce9cf825faadf5276b2bd2b1b6a891 100644
--- a/third_party/WebKit/LayoutTests/platform/mac/media/video-zoom-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/mac/media/video-zoom-expected.txt
@@ -1,33 +1,33 @@
-layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 844
+layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 846
   LayoutView at (0,0) size 800x600
-layer at (0,0) size 785x844 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
-  LayoutBlockFlow {HTML} at (0,0) size 785x844
-    LayoutBlockFlow {BODY} at (8,8) size 769x828
+layer at (0,0) size 785x846 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
+  LayoutBlockFlow {HTML} at (0,0) size 785x846
+    LayoutBlockFlow {BODY} at (8,8) size 769x830
       LayoutBlockFlow {P} at (0,0) size 769x18
         LayoutText {#text} at (0,0) size 289x18
           text run at (0,0) width 289: "150% zoom, with width and height attributes"
-      LayoutBlockFlow (anonymous) at (0,34) size 769x372
-        LayoutText {#text} at (0,354) size 4x18
-          text run at (0,354) width 4: " "
-        LayoutBR {BR} at (492,368) size 0x0
-      LayoutBlockFlow {P} at (0,422) size 769x18
+      LayoutBlockFlow (anonymous) at (0,34) size 769x373
+        LayoutText {#text} at (0,355) size 4x18
+          text run at (0,355) width 4: " "
+        LayoutBR {BR} at (493,369) size 0x0
+      LayoutBlockFlow {P} at (0,423) size 769x18
         LayoutText {#text} at (0,0) size 309x18
           text run at (0,0) width 309: "150% zoom, without width and height attributes"
-      LayoutBlockFlow (anonymous) at (0,456) size 769x372
-        LayoutText {#text} at (0,354) size 4x18
-          text run at (0,354) width 4: " "
-        LayoutBR {BR} at (492,368) size 0x0
-layer at (12,42) size 488x368
-  LayoutVideo {VIDEO} at (4,0) size 488x368 [border: (4px solid #FF0000)]
-layer at (12,464) size 488x368 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
-  LayoutVideo {VIDEO} at (4,0) size 488x368 [border: (4px solid #FF0000)]
-layer at (16,46) size 480x360
-  LayoutFlexibleBox (relative positioned) {DIV} at (4,4) size 480x360
+      LayoutBlockFlow (anonymous) at (0,457) size 769x373
+        LayoutText {#text} at (0,355) size 4x18
+          text run at (0,355) width 4: " "
+        LayoutBR {BR} at (493,369) size 0x0
+layer at (12,42) size 489x369
+  LayoutVideo {VIDEO} at (4,0) size 489x369 [border: (4.50px solid #FF0000)]
+layer at (12,465) size 489x369 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
+  LayoutVideo {VIDEO} at (4,0) size 489x369 [border: (4.50px solid #FF0000)]
+layer at (17,47) size 480x360
+  LayoutFlexibleBox (relative positioned) {DIV} at (4.50,4.50) size 480x360
     LayoutBlockFlow {DIV} at (0,312) size 480x48
-layer at (16,46) size 480x297
+layer at (17,47) size 480x297
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 480x297
-layer at (16,468) size 480x360 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
-  LayoutFlexibleBox (relative positioned) {DIV} at (4,4) size 480x360
+layer at (17,470) size 480x360 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
+  LayoutFlexibleBox (relative positioned) {DIV} at (4.50,4.50) size 480x360
     LayoutBlockFlow {DIV} at (0,312) size 480x48
-layer at (16,468) size 480x297 backgroundClip at (16,468) size 480x132 clip at (16,468) size 480x132
+layer at (17,470) size 480x297 backgroundClip at (17,470) size 480x130 clip at (17,470) size 480x130
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 480x297