Temporarily change PorterDuff mode MULTIPLY to SRC_IN

Overflow pop up dialog for action bar uses PorterDuff color filters in
mode SRC_IN. The mode is not supported by AlphaComposite currently. So,
in order to render something, we swap it out with SRC_IN.

Change-Id: I987e101728ecb76b5e3d5cd91f831e6f63a4321f

tools/layoutlib/bridge/src/android/graphics/PorterDuffColorFilter_Delegate.java

@@ -98,6 +98,11 @@ public class PorterDuffColorFilter_Delegate extends ColorFilter_Delegate {
 
     private PorterDuffColorFilter_Delegate(int srcColor, int mode) {
         mSrcColor = srcColor;
+        // Temporarily change multiply to SRC_IN to render menus.
+        // TODO: support Mode.MULTIPLY
+        if (mode == Mode.MULTIPLY.nativeInt) {
+            mode = Mode.SRC_IN.nativeInt;
+        }
         mMode = getPorterDuffMode(mode);
     }