Ensure CompositedLayerMapping updates when hit testing changes

When blocking event handlers change, we need to ensure
CompositedLayerMapping updates "PaintsHitTest" on GraphicsLayers. This
is done via CompositedLayerMapping::UpdateDrawsContentAndPaintsHitTest.

Bug: 1134524
Change-Id: I7d54b709c4fe7097ee14ba34fee3f8e81bef1e03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446529
Auto-Submit: Philip Rogers <pdr@chromium.org>
Reviewed-by: Sam Fortiner <samfort@microsoft.com>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813511}

third_party/blink/renderer/core/page/scrolling/scrolling_test.cc

@@ -885,6 +885,29 @@ TEST_P(ScrollingTest, WindowTouchEventHandlerInvalidation) {
   EXPECT_TRUE(region.IsEmpty());
 }
 
+TEST_P(ScrollingTest, TouchActionChangeWithoutContent) {
+  LoadHTML(R"HTML(
+    <div id="blocking"
+        style="will-change: transform; width: 100px; height: 100px;"></div>
+  )HTML");
+  ForceFullCompositingUpdate();
+
+  // Adding a blocking window event handler should create a touch action region.
+  auto* listener = MakeGarbageCollected<ScrollingTestMockEventListener>();
+  auto* resolved_options =
+      MakeGarbageCollected<AddEventListenerOptionsResolved>();
+  resolved_options->setPassive(false);
+  auto* target_element = GetFrame()->GetDocument()->getElementById("blocking");
+  target_element->addEventListener(event_type_names::kTouchstart, listener,
+                                   resolved_options);
+  ForceFullCompositingUpdate();
+
+  const auto* cc_layer = LayerByDOMElementId("blocking");
+  cc::Region region = cc_layer->touch_action_region().GetRegionForTouchAction(
+      TouchAction::kNone);
+  EXPECT_EQ(region.bounds(), gfx::Rect(0, 0, 100, 100));
+}
+
 // Ensure we don't crash when a plugin becomes a LayoutInline
 TEST_P(ScrollingTest, PluginBecomesLayoutInline) {
   LoadHTML(R"HTML(

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

@@ -362,6 +362,7 @@ void PrePaintTreeWalk::InvalidatePaintForHitTesting(
   context.paint_invalidator_context.painting_layer->SetNeedsRepaint();
   ObjectPaintInvalidator(object).InvalidateDisplayItemClient(
       object, PaintInvalidationReason::kHitTest);
+  SetNeedsCompositingLayerPropertyUpdate(object);
 }
 
 void PrePaintTreeWalk::UpdateAuxiliaryObjectProperties(