suppress uninit error reported from *!blink::CSSPropertyParser::validUnit

tools/valgrind/drmemory/suppressions_full.txt

Index: tools/valgrind/drmemory/suppressions_full.txt
diff --git a/tools/valgrind/drmemory/suppressions_full.txt b/tools/valgrind/drmemory/suppressions_full.txt
index a5a36055f4b6816f68cd5f9242afa14b724cafe6..7d698a8fda5878a76555841f615b393a7f783c4c 100644
--- a/tools/valgrind/drmemory/suppressions_full.txt
+++ b/tools/valgrind/drmemory/suppressions_full.txt
@@ -1991,3 +1991,23 @@ gfx.dll!gfx::WindowImpl::Init
 win_window.dll!ui::WinWindow::WinWindow
 aura.dll!aura::WindowTreeHostWin::WindowTreeHostWin
 aura.dll!aura::WindowTreeHost::Create
+
+UNINITIALIZED READ
+name=bug_492821
+*!blink::CSSPropertyParser::validUnit
+*!blink::CSSPropertyParser::validWidthOrHeight
+*!blink::CSSPropertyParser::parseValue
+*!blink::CSSPropertyParser::parseValue
+*!blink::CSSParserImpl::consumeDeclarationValue
+*!blink::CSSParserImpl::consumeDeclaration
+*!blink::CSSParserImpl::consumeDeclarationList
+*!blink::CSSParserImpl::consumeStyleRule
+*!blink::CSSParserImpl::consumeQualifiedRule
+*!blink::CSSParserImpl::consumeRuleList<>
+*!blink::CSSParserImpl::parseStyleSheet
+*!blink::CSSParser::parseSheet
+*!blink::StyleSheetContents::parseStringAtPosition
+*!blink::StyleEngine::parseSheet
+*!blink::StyleEngine::createSheet
+*!blink::StyleElement::createSheet
+*!blink::StyleElement::process