BFCache: Add a browser_test for WebMIDI

Bug: 981740
Change-Id: I40605b9b6b343a3e0b4a12fe3b0e5e0b6f992390
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903182
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Fergal Daly <fergal@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713734}

content/browser/back_forward_cache_browsertest.cc

@@ -3742,4 +3742,34 @@ IN_PROC_BROWSER_TEST_F(SensorBackForwardCacheBrowserTest,
       FROM_HERE);
 }
 
+IN_PROC_BROWSER_TEST_F(BackForwardCacheBrowserTest, WebMidiNotCached) {
+  ASSERT_TRUE(embedded_test_server()->Start());
+  GURL url_a(embedded_test_server()->GetURL("/title1.html"));
+  GURL url_b(embedded_test_server()->GetURL("b.com", "/title1.html"));
+
+  // 1) Navigate to A.
+  ASSERT_TRUE(NavigateToURL(shell(), url_a));
+  RenderFrameHostImpl* rfh_a = current_frame_host();
+  RenderFrameDeletedObserver delete_observer_rfh_a(rfh_a);
+
+  // - Wait until requestMIDIAccess() promise is resolved.
+  EXPECT_TRUE(ExecJs(rfh_a, "navigator.requestMIDIAccess()"));
+
+  // 2) Navigate to B.
+  ASSERT_TRUE(NavigateToURL(shell(), url_b));
+
+  // - Page A should not be in the cache.
+  EXPECT_TRUE(delete_observer_rfh_a.deleted());
+
+  // 3) Go back.
+  web_contents()->GetController().GoBack();
+  EXPECT_TRUE(WaitForLoadStop(shell()->web_contents()));
+  ExpectNotRestored(
+      {BackForwardCacheMetrics::NotRestoredReason::kBlocklistedFeatures},
+      FROM_HERE);
+  ExpectBlocklistedFeature(
+      blink::scheduler::WebSchedulerTrackedFeature::kRequestedMIDIPermission,
+      FROM_HERE);
+}
+
 }  // namespace content