Another similar case is SkPicture::approximateBytesUsed. It has three implementations:

size_t SkEmptyPicture::approximateBytesUsed() const override { return sizeof(*this); }
size_t SkMiniPicture::approximateBytesUsed() const override { return sizeof(*this); }

size_t SkBigPicture::approximateBytesUsed() const {
    size_t bytes = sizeof(*this) + fRecord->bytesUsed() + fApproxBytesUsedBySubPictures;
    if (fBBH) { bytes += fBBH->bytesUsed(); }
    return bytes;
}

This can be devirtualized to:

if vptr == SkBigPicture {
  direct call SkBigPicture::approximateBytesUsed
} else {
  read virtual const from vtable // sizeof(*this)
}

One more case: SkBitmapDevice::onAccessPixels:
https://cs.chromium.org/chromium/src/third_party/skia/include/core/SkDevice.h?sq=package:chromium&dr=CSs&rcl=1471534131&l=292

Implementations:

bool SkDevice::onAccessPixels(SkPixmap*) { return false; }

bool SkGpuDevice::onAccessPixels(SkPixmap* pmap) {
    ASSERT_SINGLE_OWNER // debug only
    return false;
}

bool SkBitmapDevice::onAccessPixels(SkPixmap* pmap) {
    if (this->onPeekPixels(pmap)) {
        fBitmap.notifyPixelsChanged();
        return true;
    }
    return false;
}

Once again, it's simple rewrite:

if vptr == SkBitmapDevice {
  direct call SkBitmapDevice::onAccessPixels
} else {
  constant false
}