Tweaks for forward compatibility

Change-Id: I136fcbbc14072ee5f5281d09445f28d083ed3ce1
diff --git a/Source/WebCore/platform/graphics/android/layers/LayerAndroid.cpp b/Source/WebCore/platform/graphics/android/layers/LayerAndroid.cpp
index 1064388..c6f2d0d 100644
--- a/Source/WebCore/platform/graphics/android/layers/LayerAndroid.cpp
+++ b/Source/WebCore/platform/graphics/android/layers/LayerAndroid.cpp
@@ -47,9 +47,10 @@
 class OpacityDrawFilter : public SkDrawFilter {
 public:
     OpacityDrawFilter(int opacity) : m_opacity(opacity) { }
-    virtual void filter(SkPaint* paint, Type)
+    virtual bool filter(SkPaint* paint, Type)
     {
         paint->setAlpha(m_opacity);
+        return false;
     }
 private:
     int m_opacity;