Allow fractional letter- word-spacing values.

LayoutTests/platform/win/svg/custom/text-letter-spacing-expected.txt

Index: LayoutTests/platform/win/svg/custom/text-letter-spacing-expected.txt
diff --git a/LayoutTests/platform/win/svg/custom/text-letter-spacing-expected.txt b/LayoutTests/platform/win/svg/custom/text-letter-spacing-expected.txt
index 50d1c869da4aebb24f104636874178d301a09ba4..b0f1d0173da0978ac62476174ca181d4b084ff69 100644
--- a/LayoutTests/platform/win/svg/custom/text-letter-spacing-expected.txt
+++ b/LayoutTests/platform/win/svg/custom/text-letter-spacing-expected.txt
@@ -1,30 +1,30 @@
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  RenderSVGRoot {svg} at (20,12) size 349x156
-    RenderSVGContainer {g} at (20,12) size 349x156
-      RenderSVGText {text} at (10,6) size 175x18 contains 1 chunk(s)
-        RenderSVGInlineText {#text} at (0,0) size 175x18
+  RenderSVGRoot {svg} at (20,12) size 360x156
+    RenderSVGContainer {g} at (20,12) size 360x156
+      RenderSVGText {text} at (10,6) size 180x18 contains 1 chunk(s)
+        RenderSVGInlineText {#text} at (0,0) size 180x18
           chunk 1 text run 1 at (10.00,20.00) startOffset 0 endOffset 1 width 11.00: "A"
-          chunk 1 text run 2 at (39.00,20.00) startOffset 1 endOffset 2 width 10.50: "B"
-          chunk 1 text run 3 at (67.50,20.00) startOffset 2 endOffset 3 width 10.50: "C"
-          chunk 1 text run 4 at (96.00,20.00) startOffset 3 endOffset 4 width 4.00: " "
-          chunk 1 text run 5 at (118.00,20.00) startOffset 4 endOffset 5 width 11.50: "D"
-          chunk 1 text run 6 at (147.50,20.00) startOffset 5 endOffset 6 width 10.00: "E"
-          chunk 1 text run 7 at (175.50,20.00) startOffset 6 endOffset 7 width 9.00: "F"
-      RenderSVGText {text} at (10,26) size 175x18 contains 1 chunk(s)
-        RenderSVGTSpan {tspan} at (0,0) size 68x18
-          RenderSVGInlineText {#text} at (0,0) size 68x18
+          chunk 1 text run 2 at (39.90,20.00) startOffset 1 endOffset 2 width 10.50: "B"
+          chunk 1 text run 3 at (69.30,20.00) startOffset 2 endOffset 3 width 10.50: "C"
+          chunk 1 text run 4 at (98.69,20.00) startOffset 3 endOffset 4 width 4.00: " "
+          chunk 1 text run 5 at (121.59,20.00) startOffset 4 endOffset 5 width 11.50: "D"
+          chunk 1 text run 6 at (151.99,20.00) startOffset 5 endOffset 6 width 10.00: "E"
+          chunk 1 text run 7 at (180.89,20.00) startOffset 6 endOffset 7 width 9.00: "F"
+      RenderSVGText {text} at (10,26) size 180x18 contains 1 chunk(s)
+        RenderSVGTSpan {tspan} at (0,0) size 70x18
+          RenderSVGInlineText {#text} at (0,0) size 70x18
             chunk 1 text run 1 at (10.00,40.00) startOffset 0 endOffset 1 width 11.00: "A"
-            chunk 1 text run 2 at (39.00,40.00) startOffset 1 endOffset 2 width 10.50: "B"
-            chunk 1 text run 3 at (67.50,40.00) startOffset 2 endOffset 3 width 10.50: "C"
-        RenderSVGInlineText {#text} at (86,0) size 4x18
-          chunk 1 text run 1 at (96.00,40.00) startOffset 0 endOffset 1 width 4.00: " "
-        RenderSVGTSpan {tspan} at (0,0) size 67x18
-          RenderSVGInlineText {#text} at (108,0) size 67x18
-            chunk 1 text run 1 at (118.00,40.00) startOffset 0 endOffset 1 width 11.50: "D"
-            chunk 1 text run 2 at (147.50,40.00) startOffset 1 endOffset 2 width 10.00: "E"
-            chunk 1 text run 3 at (175.50,40.00) startOffset 2 endOffset 3 width 9.00: "F"
+            chunk 1 text run 2 at (39.90,40.00) startOffset 1 endOffset 2 width 10.50: "B"
+            chunk 1 text run 3 at (69.30,40.00) startOffset 2 endOffset 3 width 10.50: "C"
+        RenderSVGInlineText {#text} at (88,0) size 4x18
+          chunk 1 text run 1 at (98.69,40.00) startOffset 0 endOffset 1 width 4.00: " "
+        RenderSVGTSpan {tspan} at (0,0) size 69x18
+          RenderSVGInlineText {#text} at (111,0) size 69x18
+            chunk 1 text run 1 at (121.59,40.00) startOffset 0 endOffset 1 width 11.50: "D"
+            chunk 1 text run 2 at (151.99,40.00) startOffset 1 endOffset 2 width 10.00: "E"
+            chunk 1 text run 3 at (180.89,40.00) startOffset 2 endOffset 3 width 9.00: "F"
       RenderSVGText {text} at (10,46) size 129x18 contains 1 chunk(s)
         RenderSVGInlineText {#text} at (0,0) size 129x18
           chunk 1 text run 1 at (10.00,60.00) startOffset 0 endOffset 1 width 11.00: "A"