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NS_IMETHODIMPnsCanvasRenderingContext2D::SetTextStyle(const nsAString& style){    if (style.IsEmpty())        return NS_ERROR_INVALID_ARG;    nsAutoString fontStr(NS_LITERAL_STRING("font: "));    fontStr.Append(style);    nsresult rv;    nsCOMPtr<nsICSSStyleRule> styleRule;    rv = mCSSParser->ParseStyleAttribute(fontStr,                                         nsnull,                                         nsnull,                                         getter_AddRefs(styleRule));    if (NS_FAILED(rv))        return rv;    nsCSSDeclaration *decl = styleRule->GetDeclaration();    if (!decl)        return NS_ERROR_FAILURE;    nsRuleData rule(eStyleStruct_Font, nsnull, nsnull);    nsAutoPtr<nsRuleDataFont> fontData(new nsRuleDataFont);    rule.mFontData = fontData;    rv = decl->MapRuleInfoInto(&rule);    if (NS_FAILED(rv))        return rv;    nsAutoString fontFamily;    float size = 12.0;    if (rule.mFontData->mFamily.GetUnit() != eCSSUnit_Null)        rule.mFontData->mFamily.GetStringValue(fontFamily);    if (rule.mFontData->mSize.GetUnit() != eCSSUnit_Null)        size = rule.mFontData->mSize.GetFloatValue();    rule.mFontData = nsnull;...