[Cast, Tests] Handle low end and JB devices that don't preload videos

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 f52409a189bf390446500fbc637f8703eb04c1d0..65912295a5075bfc2681305783550c33d0e1dab8 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
@@ -159,6 +159,7 @@ public class CastSwitchVideoTest extends CastTestBase {
             TimeoutException {
         final Tab tab = getActivity().getActivityTab();
         WebContents webContents = tab.getWebContents();
+        DOMUtils.clickNode(this, tab.getContentViewCore(), "button1");
         waitUntilVideoReady(videoElement, webContents);
         Rect videoRect = DOMUtils.getNodeBounds(webContents, videoElement);
 
@@ -170,6 +171,7 @@ public class CastSwitchVideoTest extends CastTestBase {
         final Tab tab = getActivity().getActivityTab();
         WebContents webContents = tab.getWebContents();
 
+        DOMUtils.clickNode(this, tab.getContentViewCore(), "button1");
         waitUntilVideoReady(videoElement, webContents);
 
         // Need to click on the video first to overcome the user gesture requirement.