[blink] Skip ancestor clip in PaintLayerPainter for squashed layers.

third_party/WebKit/LayoutTests/compositing/squashing/squash-transformed-with-clip.html

Index: third_party/WebKit/LayoutTests/compositing/squashing/squash-transformed-with-clip.html
diff --git a/third_party/WebKit/LayoutTests/compositing/squashing/squash-transformed-with-clip.html b/third_party/WebKit/LayoutTests/compositing/squashing/squash-transformed-with-clip.html
new file mode 100644
index 0000000000000000000000000000000000000000..7af100e264bfa0f19b7fd44e4ec83e93e68e9bdf
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/compositing/squashing/squash-transformed-with-clip.html
@@ -0,0 +1,20 @@
+<style>
+#overlap {
+  width: 10px;
+  height: 100px;
+  background: green;
+  will-change: transform;
+}
+#transformed {
+  position: absolute;
+  left: 0;
+  top: 0;
+  overflow: hidden;
+  transform: translate(0, 50px);
+}
+</style>
+<div id="overlap"></div>
+<div id="transformed">
+  This test succeeds if this text is visible.
+</div>
+This test verifies squashed transformed elements have their ancestor clip and local clip applied in the correct spaces.