More valgrind suppressions

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index 5dc92708ce72f5523f3207004c1e2553c2f8e243..1957fdaef85e34b7a0636b99b6175b422e9fe2c0 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -1128,3 +1128,20 @@
    fun:_Znw*
    fun:_ZN7history14HistoryBackend12AddPageVisitERK4GURLN4base4TimeExj
 }
+{
+   bug_20939
+   Memcheck:Cond
+   fun:_ZN7WebCore9CSSParser9validUnitEPNS_14CSSParserValueENS0_5UnitsEb
+   fun:_ZN7WebCore9CSSParser10parseValueEib
+   fun:_Z10cssyyparsePv
+}
+{
+   bug_20941
+   Memcheck:Cond
+   fun:_ZNK7WebCore23RenderThemeChromiumSkia21adjustSliderThumbSizeEPNS_12RenderObjectE
+   fun:_ZN7WebCore12RenderSlider6layoutEv
+   ...
+   fun:_ZN7WebCore10RenderView6layoutEv
+   fun:_ZN7WebCore9FrameView6layoutEb
+   fun:_ZN7WebCore8Document12updateLayoutEv
+}