OWNERS files updated with latest COMPONENT and TEAMS.

This is CL is generated by a script. Data is pulled from
review conducted in Q2 2019. See https://tinyurl.com/yxau5sc4
for context.

Bug: 977050
Change-Id: I43d33469da6f95e9a997f154433a84d0b3aefc0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700849Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Nicolas Zea <zea@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683949}

chrome/browser/ntp_snippets/OWNERS

 file://components/ntp_snippets/OWNERS
+# COMPONENT: UI>Browser>NewTabPage

components/ntp_snippets_strings_grdp/OWNERS

 file://components/ntp_snippets/OWNERS
+# COMPONENT: UI>Browser>NewTabPage

content/test/gpu/OWNERS

@@ -11,4 +11,5 @@ crouleau@chromium.org
 # Emeritus:
 # dtu@chromium.org
 
-# COMPONENT: Test
+# COMPONENT: Internals>GPU>Internals
+# TEAM: graphics-dev@chromium.org

google_apis/gcm/OWNERS

@@ -3,3 +3,4 @@ peter@chromium.org
 zea@chromium.org
 
 # COMPONENT: Services>CloudMessaging
+# TEAM: platform-capabilities@chromium.org

third_party/libcxx-pretty-printers/OWNERS

 dpranke@chromium.org
 leszeks@chromium.org
 thomasanderson@chromium.org
+# COMPONENT: Tools