Disable flaky PortalsTest#testTouchTransferAfterTouchStartActivate

BUG=1024850
TBR=adithyas@chromium.org,agrieve@chromium.org

Change-Id: Ib99f9a64f4bea821efc5bab831233aa9e8928680
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919726Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715880}

chrome/android/javatests/src/org/chromium/chrome/browser/portals/PortalsTest.java

@@ -17,6 +17,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.ChromeSwitches;
@@ -246,6 +247,7 @@ public class PortalsTest {
     @Test
     @MediumTest
     @Feature({"Portals"})
+    @DisabledTest // Disabled due to flakiness. See https://crbug.com/1024850
     public void testTouchTransferAfterTouchStartActivate() throws Exception {
         mActivityTestRule.startMainActivityWithURL(mTestServer.getURL(
                 "/chrome/test/data/android/portals/touch-transfer.html?event=touchstart"));