Add isFilterBitmap() overrides where appropriate

Issue #21825791 add isFilterBitmap() override to appropriate Drawable subclasses

Change-Id: I5cbd72c034be79b0aa53815c7a5a8ea499e6e02d

graphics/java/android/graphics/drawable/BitmapDrawable.java

@@ -351,6 +351,11 @@ public class BitmapDrawable extends Drawable {
         invalidateSelf();
     }
 
+    @Override
+    public boolean isFilterBitmap() {
+        return mBitmapState.mPaint.isFilterBitmap();
+    }
+
     @Override
     public void setDither(boolean dither) {
         mBitmapState.mPaint.setDither(dither);

graphics/java/android/graphics/drawable/NinePatchDrawable.java

@@ -398,6 +398,14 @@ public class NinePatchDrawable extends Drawable {
         invalidateSelf();
     }
 
+    @Override
+    public boolean isFilterBitmap() {
+        if (mPaint == null) {
+            return false;
+        }
+        return getPaint().isFilterBitmap();
+    }
+
     @Override
     public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Theme theme)
             throws XmlPullParserException, IOException {