Add kaleidoscope owners file and to .gitignore

Add owners file for //chrome/browser/media/kaleidoscope
which is where the public kaleidoscope code will live. The
internal code will be in an internal repo that lives at
//chrome/browser/media/kaleidoscope/internal.

BUG=1023055

Change-Id: I37308be66f9612fff4fd0a194b5dedcfabd77972
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907597Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714303}

.gitignore

@@ -100,6 +100,7 @@ vs-chromium-project.txt
 /chrome/browser/google/linkdoctor_internal
 /chrome/browser/internal
 /chrome/browser/media/engagement_internal
+/chrome/browser/media/kaleidoscope/internal
 /chrome/browser/performance_monitor/performance_monitor.xml
 /chrome/browser/protector/internal
 /chrome/browser/resources/chromeos/quickoffice

chrome/browser/media/kaleidoscope/OWNERS

+beccahughes@chromium.org
+steimel@chromium.org
+mlamouri@chromium.org
+
+# COMPONENT: Internals>Media>UI