Batch CopylessPasteTests.

Reduces test time from 34734ms to 5196ms

Bug: 989569
Change-Id: I8f7b179c88c2ee46d964e07075ecca71ea4c4f81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437784Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: benjamin joyce <bjoyce@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816335}

chrome/android/javatests/src/org/chromium/chrome/browser/CopylessPasteTest.java

@@ -15,6 +15,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import org.chromium.base.test.util.Batch;
 import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
@@ -38,6 +39,7 @@ import java.util.concurrent.TimeoutException;
 
 /** Tests Copyless Paste AppIndexing using instrumented tests. */
 @RunWith(ChromeJUnit4ClassRunner.class)
+@Batch(Batch.PER_CLASS)
 @CommandLineFlags.
 Add({ChromeSwitches.DISABLE_FIRST_RUN_EXPERIENCE, "enable-features=CopylessPaste"})
 @Restriction(Restriction.RESTRICTION_TYPE_NON_LOW_END_DEVICE)