Update RasterInvalidatorTest.ImplicitFullLayerInvalidation

The line "ASSERT_EQ(1u, invalidations.size());" was mistakenly removed
in https://chromium-review.googlesource.com/c/chromium/src/+/1955484/3/third_party/blink/renderer/platform/graphics/paint/raster_invalidator_test.cc#b98.

Change the test to use EXPECT_THAT(..., ElementsAre()) for better
readability of code and failure message.

TBR=pdr@chromium.org

Change-Id: If818878796390e86d5b30761be27b985c2593516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955486Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722717}

third_party/blink/renderer/platform/graphics/paint/raster_invalidator_test.cc

@@ -98,10 +98,12 @@ TEST_P(RasterInvalidatorTest, ImplicitFullLayerInvalidation) {
   invalidator_.SetTracksRasterInvalidations(true);
   invalidator_.Generate(artifact, kDefaultLayerBounds,
                         DefaultPropertyTreeState());
-  const auto& invalidations = TrackedRasterInvalidations();
-  EXPECT_EQ(IntRect(IntPoint(), kDefaultLayerBounds.Size()),
-            invalidations[0].rect);
-  EXPECT_EQ(PaintInvalidationReason::kFullLayer, invalidations[0].reason);
+  const auto& client = artifact->PaintChunks()[0].id.client;
+  EXPECT_THAT(TrackedRasterInvalidations(),
+              ElementsAre(RasterInvalidationInfo{
+                  &client, client.DebugName(),
+                  IntRect(IntPoint(), kDefaultLayerBounds.Size()),
+                  PaintInvalidationReason::kFullLayer}));
   FinishCycle(*artifact);
   invalidator_.SetTracksRasterInvalidations(false);
 }