[sync] Add android test that ensures tabs get a valid sync id

chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/OpenTabsTest.java

Index: chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/OpenTabsTest.java
diff --git a/chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/OpenTabsTest.java b/chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/OpenTabsTest.java
index d09e427187a4dda39cccb47ba2c608f7e1f54d44..aebb750f84870b875ed1ed78e0a2847bba51f475 100644
--- a/chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/OpenTabsTest.java
+++ b/chrome/android/sync_shell/javatests/src/org/chromium/chrome/browser/sync/OpenTabsTest.java
@@ -15,9 +15,12 @@ import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.FlakyTest;
 import org.chromium.base.test.util.RetryOnFailure;
+import org.chromium.chrome.browser.TabState;
+import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.chrome.browser.tabmodel.TabModelUtils;
 import org.chromium.chrome.test.util.browser.sync.SyncTestUtil;
+import org.chromium.components.sync.SyncConstants;
 import org.chromium.components.sync.protocol.EntitySpecifics;
 import org.chromium.components.sync.protocol.SessionHeader;
 import org.chromium.components.sync.protocol.SessionSpecifics;
@@ -177,6 +180,26 @@ public class OpenTabsTest extends SyncTestBase {
         waitForLocalTabsForClient(FAKE_CLIENT);
     }
 
+    // Test
+    @LargeTest
+    @Feature({"Sync"})
+    public void testTabGetsValidSyncId() throws Exception {
+        Tab tab = loadUrlInNewTab(URL);
+
+        TabState state = tab.getState();
+        assertFalse(state.syncId == SyncConstants.INVALID_TAB_NODE_ID);
+    }
+
+    // Test
+    @LargeTest
+    @Feature({"Sync"})
+    public void testIncognitoTabGetsInvalidSyncId() throws Exception {
+        Tab tab = loadUrlInNewTab(URL, /*incognito=*/true);
+
+        TabState state = tab.getState();
+        assertEquals(state.syncId, SyncConstants.INVALID_TAB_NODE_ID);
+    }
+
     private String makeSessionTag() {
         return SESSION_TAG_PREFIX + (mSessionTagCounter++);
     }