Make sure View classes in ash/system/tray + others have specific class names.

Currently, some View subclasses do not override
getClassName(), so their class names will be "View" instead of something more specific like "AppListFolderView".
This branch overrides getClassName() for all View subclasses in the following directories:
ash/system/cast
ash/system/locale
ash/system/overview
ash/system/session
ash/system/tray

Bug: 962561
Test: None
Change-Id: I04e57a53f3f4f5e362a39b848bc30d48b4e468c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616971
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: MyungJae Lee <myungjaelee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661525}
26 files changed