[test] Add regression test for crbug.com/1104580

The test was not added with the fix of bug because there were problems
with Mac and Windows.

R=kainino@chromium.org

Bug: chromium:1104580
Change-Id: Iafca0c9471f37d2897fd2b8fde1aae3c8c1fb38b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320274
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792468}

third_party/blink/web_tests/VirtualTestSuites

@@ -32,6 +32,11 @@
     "bases": ["fast/canvas"],
     "args": ["--enable-accelerated-2d-canvas"]
   },
+  {
+    "prefix": "unsafe_webgpu",
+    "bases": ["regress/regress-1104580.html"],
+    "args": ["--enable-unsafe-webgpu"]
+  },
   {
     "prefix": "isolated_world_csp",
     "bases": ["http/tests/security/isolatedWorld"],

third_party/blink/web_tests/regress/regress-1104580.html

+<title>Regression tests for crbug.com/1104580</title>
+<script src="../resources/testharness.js"></script>
+<script src="../resources/testharnessreport.js"></script>
+
+<script>
+async_test((test) => {
+  if (!navigator.gpu) {
+    // {navigator.gpu} is required for this test, but it only exists on
+    // Windows. If it does not exist, we end the test immediately.
+    test.done();
+    return;
+  }
+    navigator.gpu.requestAdapter().then(adapter => {
+      if (!adapter) {
+        test.done();
+        return;
+      }
+      return adapter.requestDevice();
+    }).then(device => {
+    if (!device) {
+      test.done();
+      return;
+    }
+    device.createBufferMapped({
+              size: 24,
+              usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
+          });
+    device.createBufferMapped({
+              size: 0,
+              usage: GPUBufferUsage.VERTEX | 2261634.5098
+          });
+    test.done();
+  });
+}, 'Regression test for crbug.com/1104580');
+</script>
+

third_party/blink/web_tests/virtual/unsafe_webgpu/README.md

+# This suite runs the regress/regress-1104580.html test with
+# --enable-unsafe-webgpu.
+# This feature is required to trigger the bug found in crbug.com/1104580.