WebVTT: Support fractional percentage values for position/line/size

LayoutTests/media/track/opera/track/webvtt/parsing/support/settings-position.vtt

Index: LayoutTests/media/track/opera/track/webvtt/parsing/support/settings-position.vtt
diff --git a/LayoutTests/media/track/opera/track/webvtt/parsing/support/settings-position.vtt b/LayoutTests/media/track/opera/track/webvtt/parsing/support/settings-position.vtt
index 531cf9fec06f91f37b752792adf217bbaae2890e..107a2f8381130652118308ad745adecaeab58303 100644
--- a/LayoutTests/media/track/opera/track/webvtt/parsing/support/settings-position.vtt
+++ b/LayoutTests/media/track/opera/track/webvtt/parsing/support/settings-position.vtt
@@ -3,9 +3,18 @@ WEBVTT
 00:00:00.000 --> 00:00:01.000 position:-1%
 {}
 
+00:00:00.000 --> 00:00:01.000 position:-1.5%
+{}
+
 00:00:00.000 --> 00:00:01.000 position:1
 {}
 
+00:00:00.000 --> 00:00:01.000 position:1.5

[philipj_slow, 2015/01/22 12:55:44]

Maybe test with 1.0 to check that it's not just a matter of the result having a
zero fractional part.

[fs, 2015/01/22 13:17:06]

Done.

+{}
+
+00:00:00.000 --> 00:00:01.000 position:-50.25
+{}
+
 00:00:00.000 --> 00:00:01.000 position:1x
 {}
 
@@ -31,10 +40,19 @@ WEBVTT
 {"position":1}
 
 00:00:00.000 --> 00:00:01.000 position:1.5%
-{}
+{"position":1.5}
+
+00:00:00.000 --> 00:00:01.000 position:10.25%
+{"position":10.25}
 
 00:00:00.000 --> 00:00:01.000 position:65536%
 {}
 
 00:00:00.000 --> 00:00:01.000 position:4294967296%
-{}
+{}
+
+00:00:00.000 --> 00:00:01.000 position:.5%
+{"position":0.5}
+
+00:00:00.000 --> 00:00:01.000 position:5.%
+{"position":5}