Revert of Remove deprecated paths from image filter infrastructure.

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 2377b57dfb7482f0ec40dd781245bd77dfb05b04..c15aeccf82dc52786b6899cfcdbfabc885fe9e36 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -280,6 +280,28 @@
     */
     virtual const SkBitmap& onAccessBitmap() = 0;
 
+    /**
+     *  Override and return true for filters that the device can handle
+     *  intrinsically. Doing so means that SkCanvas will pass-through this
+     *  filter to drawSprite and drawDevice (and potentially filterImage).
+     *  Returning false means the SkCanvas will have apply the filter itself,
+     *  and just pass the resulting image to the device.
+     */
+    virtual bool canHandleImageFilter(const SkImageFilter*) { return false; }
+
+    /**
+     *  Related (but not required) to canHandleImageFilter, this method returns
+     *  true if the device could apply the filter to the src bitmap and return
+     *  the result (and updates offset as needed).
+     *  If the device does not recognize or support this filter,
+     *  it just returns false and leaves result and offset unchanged.
+     */
+    virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
+                             const SkImageFilter::Context&,
+                             SkBitmap* /*result*/, SkIPoint* /*offset*/) {
+        return false;
+    }
+
 protected:
     virtual sk_sp<SkSurface> makeSurface(const SkImageInfo&, const SkSurfaceProps&);
     virtual bool onPeekPixels(SkPixmap*) { return false; }