Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/.mailmap

Index: third_party/libvpx/source/libvpx/.mailmap
diff --git a/third_party/libvpx/source/libvpx/.mailmap b/third_party/libvpx/source/libvpx/.mailmap
new file mode 100644
index 0000000000000000000000000000000000000000..0bfda120f9886993f8c2c1d3a3caf8aa03bcaa2c
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/.mailmap
@@ -0,0 +1,26 @@
+Adrian Grange <agrange@google.com>
+Alex Converse <aconverse@google.com> <alex.converse@gmail.com>
+Alexis Ballier <aballier@gentoo.org> <alexis.ballier@gmail.com>
+Alpha Lam <hclam@google.com> <hclam@chromium.org>
+Deb Mukherjee <debargha@google.com>
+Erik Niemeyer <erik.a.niemeyer@intel.com> <erik.a.niemeyer@gmail.com>
+Guillaume Martres <gmartres@google.com> <smarter3@gmail.com>
+Hangyu Kuang <hkuang@google.com>
+Jim Bankoski <jimbankoski@google.com>
+Johann Koenig <johannkoenig@google.com>
+Johann Koenig <johannkoenig@google.com> <johann.koenig@duck.com>
+John Koleszar <jkoleszar@google.com>
+Joshua Litt <joshualitt@google.com> <joshualitt@chromium.org>
+Marco Paniconi <marpan@google.com>
+Marco Paniconi <marpan@google.com> <marpan@chromium.org>
+Pascal Massimino <pascal.massimino@gmail.com>
+Paul Wilkins <paulwilkins@google.com>
+Ralph Giles <giles@xiph.org> <giles@entropywave.com>
+Ralph Giles <giles@xiph.org> <giles@mozilla.com>
+Sami Pietilä <samipietila@google.com>
+Tamar Levy <tamar.levy@intel.com>
+Tamar Levy <tamar.levy@intel.com> <levytamar82@gmail.com>
+Tero Rintaluoma <teror@google.com> <tero.rintaluoma@on2.com>
+Timothy B. Terriberry <tterribe@xiph.org> Tim Terriberry <tterriberry@mozilla.com>
+Tom Finegan <tomfinegan@google.com>
+Yaowu Xu <yaowu@google.com> <yaowu@xuyaowu.com>