Require a PaintLayer for applying 'clip-path'

Similarly as for effects. 'clip-path' is (sometimes, if mask) applied
via PaintLayerPainter, and we need an SVGResourceClient for it to manage
resources properly (respond to clip-path changes etc.).

See also crbug.com/892734.

Bug: 1158417, 1028063
Change-Id: I2aae303c6dcbf9bd5964bf40253a7fa7cb733058
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589876Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#836732}

third_party/blink/renderer/core/paint/paint_property_tree_builder.cc

@@ -991,7 +991,10 @@ void FragmentPaintPropertyTreeBuilder::UpdateTransform() {
 }
 
 static bool MayNeedClipPathClip(const LayoutObject& object) {
-  return !object.IsText() && object.StyleRef().ClipPath();
+  // We only apply clip-path if the LayoutObject has a layer or is an SVG
+  // child. See NeedsEffect() for additional information on the former.
+  return !object.IsText() && object.StyleRef().ClipPath() &&
+         (object.HasLayer() || object.IsSVGChild());
 }
 
 static bool NeedsClipPathClip(const LayoutObject& object) {