Force portrait mode first in testTabSuggestionMessageCard_orientation

The device can be wrongly in landscape mode before the test starts,
which make the test flaky. Now we force portrait mode before
testTabSuggestionMessageCard_orientation starts.

Bug: 1063639
Change-Id: Ic532a252f9ccaebb70ed7fb4ca0bc1ab96bc8f8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2114391Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752560}

chrome/android/features/start_surface/internal/javatests/src/org/chromium/chrome/features/start_surface/StartSurfaceLayoutTest.java

@@ -986,6 +986,9 @@ public class StartSurfaceLayoutTest {
         enterGTSWithThumbnailChecking();
         CriteriaHelper.pollUiThread(TabSwitcherCoordinator::hasAppendedMessagesForTesting);
 
+        // Force portrait mode since the device can be wrongly in landscape. See crbug/1063639.
+        rotateDeviceToOrientation(cta, Configuration.ORIENTATION_PORTRAIT);
+
         onView(withId(R.id.tab_list_view))
                 .check(MessageCardWidthAssertion.checkMessageItemSpanSize(3, 2));