Added available bit to m_selectorIndex.

third_party/WebKit/LayoutTests/fast/css/selector-list-limits.html

Index: third_party/WebKit/LayoutTests/fast/css/selector-list-limits.html
diff --git a/third_party/WebKit/LayoutTests/fast/css/selector-list-limits.html b/third_party/WebKit/LayoutTests/fast/css/selector-list-limits.html
index e7fc1606fa6a214ebc440c6b0dd2ba07d3b4d214..00119cab383e963ff3569fe24eec5e828f9ad838 100644
--- a/third_party/WebKit/LayoutTests/fast/css/selector-list-limits.html
+++ b/third_party/WebKit/LayoutTests/fast/css/selector-list-limits.html
@@ -14,7 +14,7 @@ function selectors(n) {
   return list.join(', ');
 }
 
-var selectorLimit = 8192;
+var selectorLimit = 16384;

[rune, 2017/03/31 17:52:34]

This is basically test the same as the unit test I added. Should I just remove
this test? I think a unit test is more suitable for this.

[meade_UTC10, 2017/04/03 04:11:33]

Yeah it makes sense to remove it, unless there's some cross-platform spec'ed
limit that I don't know about...

 style.textContent = selectors(selectorLimit - 1) + ', #target { width: 100px; }\n' +
                     selectors(selectorLimit) + ', #target { height: 100px; }';