Views: Add and update OWNERS files for the Chrome for ChromeOS team

Bug: None
Change-Id: I5df989a4da37be103e8cc2fc2542593b024f62c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529734
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826635}

chrome/browser/ui/views/bubble/OWNERS

+robliao@chromium.org
+romanarora@chromium.org
+tluk@chromium.org
+yuhengh@chromium.org
+
+# COMPONENT: UI>Browser>Bubbles

chrome/browser/ui/views/tabs/OWNERS

@@ -5,6 +5,8 @@ pkasting@chromium.org
 sky@chromium.org
 tbergquist@chromium.org
 
+per-file tab_search_button*=tluk@chromium.org
+
 # For changes related to the tab alert indicator/button.
 miu@chromium.org