Update framework to wait for object before dismissing chrome popup

* Added wait for exist for google terms accept.

* Reduced wait time for device sync negative button to reduce workload run
  time.

wa/framework/uiauto/app/src/main/java/com/arm/wa/uiauto/BaseUiAutomation.java

@@ -593,14 +593,15 @@ public class BaseUiAutomation {
         UiObject accept =
             mDevice.findObject(new UiSelector().resourceId("com.android.chrome:id/terms_accept")
                 .className("android.widget.Button"));
-        if (accept.exists()){
+        if (accept.waitForExists(3000)){
             accept.click();
             UiObject negative =
                 mDevice.findObject(new UiSelector().resourceId("com.android.chrome:id/negative_button")
                     .className("android.widget.Button"));
-            negative.waitForExists(100000);
+            if (negative.waitForExists(10000)) {
                 negative.click();
             }      
+        }
         UiObject lite =
             mDevice.findObject(new UiSelector().resourceId("com.android.chrome:id/button_secondary")
                 .className("android.widget.Button"));