Mark some cast tests flaky.

chrome/android/javatests/src/org/chromium/chrome/browser/media/remote/CastSwitchVideoTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/media/remote/CastSwitchVideoTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/media/remote/CastSwitchVideoTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/media/remote/CastSwitchVideoTest.java
index 1dc6eb879d6b12dc46d416fcd625284c7221eeb4..fe1dbc04bbe65d8ec5d668e047a85d63c42760a4 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/media/remote/CastSwitchVideoTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/media/remote/CastSwitchVideoTest.java
@@ -8,6 +8,7 @@
 import android.test.suitebuilder.annotation.LargeTest;
 
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.FlakyTest;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.util.FeatureUtilities;
 import org.chromium.content.browser.test.util.DOMUtils;
@@ -42,6 +43,7 @@ public void run() {
 
     @Feature({"VideoFling"})
     @LargeTest
+    @FlakyTest
     public void testPlayNewVideoNewPageSameTab() throws InterruptedException, TimeoutException {
         checkPlaySecondVideo(DEFAULT_VIDEO_PAGE, VIDEO_ELEMENT, new Runnable() {
             @Override
@@ -58,6 +60,7 @@ public void run() {
 
     @Feature({"VideoFling"})
     @LargeTest
+    @FlakyTest
     public void testPlayTwoVideosSamePage() throws InterruptedException, TimeoutException {
         checkPlaySecondVideo(TWO_VIDEO_PAGE, VIDEO_ELEMENT_2, new Runnable() {
             @Override
@@ -91,6 +94,7 @@ public void run() {
 
     @Feature({"VideoFling"})
     @LargeTest
+    @FlakyTest
     public void testCastNewVideoNewPageSameTab() throws InterruptedException, TimeoutException {
         checkCastSecondVideo(DEFAULT_VIDEO_PAGE, new Runnable() {
             @Override