Mark testClearCookiesOnSubpage flaky.

TBR: dullweber@chromium.org
Bug: 1147236
Change-Id: I683395e551bb31c9f0e3448fe5c75e06583390d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527529Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825610}

chrome/android/javatests/src/org/chromium/chrome/browser/page_info/PageInfoViewTest.java

@@ -37,6 +37,7 @@ import org.junit.runner.RunWith;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.FlakyTest;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.flags.ChromeSwitches;
 import org.chromium.chrome.browser.night_mode.ThemeType;
@@ -385,6 +386,7 @@ public class PageInfoViewTest {
     @Test
     @MediumTest
     @Features.EnableFeatures(PageInfoFeatureList.PAGE_INFO_V2)
+    @FlakyTest(message = "https://crbug.com/1147236")
     public void testClearCookiesOnSubpage() throws Exception {
         mActivityTestRule.loadUrl(mTestServerRule.getServer().getURL(sSiteDataHtml));
         // Create cookies.