Support subpixel layout for borders.

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

Index: third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-expected.txt b/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-expected.txt
index 4901c8067e2f796d531ec7a67158a8a599623f68..83908a3a370084e216fdd2cee4fbd2e1106dbd7f 100644
--- a/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-expected.txt
@@ -1,33 +1,33 @@
-layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 850
+layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 852
   LayoutView at (0,0) size 800x600
-layer at (0,0) size 785x850 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
-  LayoutBlockFlow {HTML} at (0,0) size 785x850
-    LayoutBlockFlow {BODY} at (8,8) size 769x834
+layer at (0,0) size 785x852 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
+  LayoutBlockFlow {HTML} at (0,0) size 785x852
+    LayoutBlockFlow {BODY} at (8,8) size 769x836
       LayoutBlockFlow {P} at (0,0) size 769x20
         LayoutText {#text} at (0,0) size 268x19
           text run at (0,0) width 268: "150% zoom, with width and height attributes"
-      LayoutBlockFlow (anonymous) at (0,36) size 769x373
-        LayoutText {#text} at (0,353) size 4x19
-          text run at (0,353) width 4: " "
-        LayoutBR {BR} at (492,368) size 0x0
-      LayoutBlockFlow {P} at (0,425) size 769x20
+      LayoutBlockFlow (anonymous) at (0,36) size 769x374
+        LayoutText {#text} at (0,354) size 4x19
+          text run at (0,354) width 4: " "
+        LayoutBR {BR} at (493,369) size 0x0
+      LayoutBlockFlow {P} at (0,426) size 769x20
         LayoutText {#text} at (0,0) size 287x19
           text run at (0,0) width 287: "150% zoom, without width and height attributes"
-      LayoutBlockFlow (anonymous) at (0,461) size 769x373
-        LayoutText {#text} at (0,353) size 4x19
-          text run at (0,353) width 4: " "
-        LayoutBR {BR} at (492,368) size 0x0
-layer at (12,44) size 488x368
-  LayoutVideo {VIDEO} at (4,0) size 488x368 [border: (4px solid #FF0000)]
-layer at (12,469) 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 (16,48) size 480x360
-  LayoutFlexibleBox (relative positioned) {DIV} at (4,4) size 480x360
+      LayoutBlockFlow (anonymous) at (0,462) size 769x374
+        LayoutText {#text} at (0,354) size 4x19
+          text run at (0,354) width 4: " "
+        LayoutBR {BR} at (493,369) size 0x0
+layer at (12,44) size 489x369
+  LayoutVideo {VIDEO} at (4,0) size 489x369 [border: (4.50px solid #FF0000)]
+layer at (12,470) 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 (17,49) size 480x360
+  LayoutFlexibleBox (relative positioned) {DIV} at (4.50,4.50) size 480x360
     LayoutBlockFlow {DIV} at (0,312) size 480x48
-layer at (16,48) size 480x297
+layer at (17,49) size 480x297
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 480x297
-layer at (16,473) 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 (17,475) 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 (16,473) size 480x297 backgroundClip at (16,473) size 480x127 clip at (16,473) size 480x127
+layer at (17,475) size 480x297 backgroundClip at (17,475) size 480x125 clip at (17,475) size 480x125
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 480x297