Disable flaky test: PortalBrowserTest.TouchInputTransferAcrossReactivation

[sheriff] This is a reland of bf1742a3
to disable a flaky test until adithyas@ can take another look.


Original change's description:
> Portals: Disable TouchInputTransferAcrossReactivation
>
> Test fails flakily on all aura platforms.
>
> Bug: 1010675
> Change-Id: Ic1906b0421dab41ddc14f36462aff459867afc33
> Tbr: lfg@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836007
> Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
> Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702230}

Bug: 1010675
Tbr: lfg@chromium.org
Change-Id: Icbddd9cb318b1bf25678b4e812a62382e953a937
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860297Reviewed-by: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705591}

content/browser/portal/portal_browsertest.cc

@@ -993,10 +993,11 @@ IN_PROC_BROWSER_TEST_F(PortalBrowserTest, TouchInputTransferAcrossActivation) {
 }
 #endif
 
+// TODO(crbug.com/1010675): Test fails flakily.
 // Touch input transfer is only implemented in the content layer for Aura.
 #if defined(USE_AURA)
 IN_PROC_BROWSER_TEST_F(PortalBrowserTest,
-                       TouchInputTransferAcrossReactivation) {
+                       DISABLED_TouchInputTransferAcrossReactivation) {
   EXPECT_TRUE(NavigateToURL(
       shell(), embedded_test_server()->GetURL(
                    "portal.test",