Ensure we don't crash when asking for variables that don't exist from the computed style.

third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp

Index: third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp b/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
index d48c9b646cb182520c5e8bf76115bfd3637220e8..da497fdda56c1c08a7122a6283a7926e3abd0a7b 100644
--- a/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/third_party/WebKit/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -641,9 +641,12 @@ String CSSComputedStyleDeclaration::getPropertyValue(const String& propertyName)
 {
     CSSPropertyID propertyID = cssPropertyID(propertyName);
     if (!propertyID) {
-        if (!RuntimeEnabledFeatures::cssVariablesEnabled() || !CSSVariableParser::isValidVariableName(propertyName))
-            return String();
-        return getPropertyCSSValue(AtomicString(propertyName))->cssText();
+        if (RuntimeEnabledFeatures::cssVariablesEnabled() && CSSVariableParser::isValidVariableName(propertyName)) {
+            RefPtrWillBeRawPtr<CSSValue> value = getPropertyCSSValue(AtomicString(propertyName));
+            if (value)

[dstockwell, 2015/12/08 21:32:39]

indentation

[shans, 2015/12/08 21:49:25]

I think the indentation here is correct?

+                return value->cssText();
+        }
+        return String();
     }
     ASSERT(CSSPropertyMetadata::isEnabledProperty(propertyID));
     return getPropertyValue(propertyID);