Oilpan: fix build after r183460.

Source/core/css/CSSGradientValue.cpp

Index: Source/core/css/CSSGradientValue.cpp
diff --git a/Source/core/css/CSSGradientValue.cpp b/Source/core/css/CSSGradientValue.cpp
index 59aa9420fd79ba6fd62225e48583cc729b9cc689..7830aeae52f7f0f0a41d2781cb1704b6bd4c4654 100644
--- a/Source/core/css/CSSGradientValue.cpp
+++ b/Source/core/css/CSSGradientValue.cpp
@@ -101,7 +101,9 @@ void CSSGradientValue::sortStopsIfNeeded()
     }
 }
 
-struct GradientStop {
+class GradientStop {
+    ALLOW_ONLY_INLINE_ALLOCATION();

[sof, 2014/10/09 15:10:36]

We could leave this out, not sure it is worth it.

The value object is used as a vector element, in a local array and as single
stack allocated value.

[sof, 2014/10/09 15:32:20]

Landing now to heal the tree. If preferable without, will follow up.

+public:
     Color color;
     float offset;
     bool specified;
@@ -112,6 +114,22 @@ struct GradientStop {
     { }
 };
 
+} // namespace blink
+
+// Escape out and declare VectorTraits for GradientStop before it is used
+// in a HeapVector with an inline capacity.
+namespace WTF  {
+
+template<>
+struct VectorTraits<blink::GradientStop> : SimpleClassVectorTraits<blink::GradientStop> {

[haraken, 2014/10/09 15:05:35]

Can we use WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS instead?

[sof, 2014/10/09 15:10:36]

The needsDestruction override is needed, unfortunately.

+    // IsPod<> doesn't handle embedded structs/enums (e.g., Color.)
+    static const bool needsDestruction = false;
+};
+
+} // namespace WTF
+
+namespace blink {
+
 PassRefPtrWillBeRawPtr<CSSGradientValue> CSSGradientValue::gradientWithStylesResolved(const TextLinkColors& textLinkColors, Color currentColor)
 {
     bool derived = false;
@@ -143,7 +161,7 @@ PassRefPtrWillBeRawPtr<CSSGradientValue> CSSGradientValue::gradientWithStylesRes
     return result.release();
 }
 
-static void replaceColorHintsWithColorStops(Vector<GradientStop>& stops, const Vector<CSSGradientColorStop, 2>& cssGradientStops)
+static void replaceColorHintsWithColorStops(WillBeHeapVector<GradientStop>& stops, const WillBeHeapVector<CSSGradientColorStop, 2>& cssGradientStops)
 {
     // This algorithm will replace each color interpolation hint with 9 regular
     // color stops. The color values for the new color stops will be calculated
@@ -253,7 +271,7 @@ void CSSGradientValue::addStops(Gradient* gradient, const CSSToLengthConversionD
 
     size_t numStops = m_stops.size();
 
-    Vector<GradientStop> stops(numStops);
+    WillBeHeapVector<GradientStop> stops(numStops);
 
     float gradientLength = 0;
     bool computedGradientLength = false;