Mark VR tests with @FlakyTest

There are more tests failing on chrome_public_test_vr_apk. Add peconn@
to TBR because a similar patch was reviewed by Peter.
See crrev.com/c/1292884

TBR=peconn@chromium.org
NOTRY=true

Bug: 894796
Change-Id: Icb52936f590ec42ccd382d129628e3497ff8cb38
Reviewed-on: https://chromium-review.googlesource.com/c/1294402Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601664}

chrome/android/javatests/src/org/chromium/chrome/browser/vr/WebXrVrInputTest.java

@@ -97,6 +97,7 @@ public class WebXrVrInputTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @DisableIf.
     Build(message = "Flaky on K/L crbug.com/762126", sdk_is_less_than = Build.VERSION_CODES.M)
     @XrActivityRestriction({XrActivityRestriction.SupportedActivity.ALL})
@@ -111,6 +112,7 @@ public class WebXrVrInputTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @DisableIf
             .Build(message = "Flaky on K/L crbug.com/762126",
                     sdk_is_less_than = Build.VERSION_CODES.M)
@@ -259,6 +261,7 @@ public class WebXrVrInputTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @Restriction(RESTRICTION_TYPE_VIEWER_NON_DAYDREAM)
     @XrActivityRestriction({XrActivityRestriction.SupportedActivity.ALL})
     public void testScreenTapsRegisteredOnCardboard() throws InterruptedException {
@@ -289,6 +292,7 @@ public class WebXrVrInputTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @Restriction(RESTRICTION_TYPE_VIEWER_NON_DAYDREAM)
     @CommandLineFlags
             .Remove({"enable-webvr"})
@@ -636,6 +640,7 @@ public class WebXrVrInputTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @Restriction(RESTRICTION_TYPE_VIEWER_DAYDREAM_OR_STANDALONE)
     @CommandLineFlags.Remove({"enable-webvr"})
     @XrActivityRestriction({XrActivityRestriction.SupportedActivity.ALL})
@@ -650,6 +655,7 @@ public class WebXrVrInputTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @Restriction(RESTRICTION_TYPE_VIEWER_NON_DAYDREAM)
     @CommandLineFlags.Remove({"enable-webvr"})
     @XrActivityRestriction({XrActivityRestriction.SupportedActivity.ALL})

chrome/android/javatests/src/org/chromium/chrome/browser/vr/WebXrVrTransitionTest.java

@@ -369,6 +369,7 @@ public class WebXrVrTransitionTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @XrActivityRestriction({XrActivityRestriction.SupportedActivity.ALL})
     public void testWindowRafStopsFiringWhilePresenting() throws InterruptedException {
         windowRafStopsFiringWhilePresentingImpl(
@@ -383,6 +384,7 @@ public class WebXrVrTransitionTest {
      */
     @Test
     @MediumTest
+    @FlakyTest(message = "https://crbug.com/894796")
     @CommandLineFlags
             .Remove({"enable-webvr"})
             @CommandLineFlags.Add({"enable-features=WebXR"})