Add keishi@ to Source/web/OWNERS, and add Source/web/resources/OWNERS.

Keishi is a frequent contributor in Source/web [1], and the originator of
Source/web/resources [2].

[1] https://blink.lc/blink/stats/Source/web?period=q&ofs=10
[2] https://blink.lc/blink/stats/Source/web/resources?period=y&ofs=10

NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1319883002

git-svn-id: svn://svn.chromium.org/blink/trunk@201365 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/OWNERS

@@ -8,6 +8,7 @@ haraken@chromium.org
 japhet@chromium.org
 jochen@chromium.org
 kbr@chromium.org
+keishi@chromium.org
 mkwst@chromium.org
 pfeldman@chromium.org
 schenney@chromium.org

third_party/WebKit/Source/web/resources/OWNERS

+keishi@chromium.org
+tkent@chromium.org