Add third_party/android_ndk to DEPS.

Following [1] to unblock the roll.

[1] https://chromium.googlesource.com/chromium/src/+/0c102b127642a641496710387dfaed09954507ae

Bug: None
Change-Id: I7744db8297cc7bf4435f02edd0a38f69da87a88a
Reviewed-on: https://webrtc-review.googlesource.com/39001
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21606}
diff --git a/DEPS b/DEPS
index 6bfabeb..b9b0d62 100644
--- a/DEPS
+++ b/DEPS
@@ -51,6 +51,10 @@
     Var('chromium_git') + '/chromium/src/testing' + '@' + '8caab93d7e90458ffebdd1bd433cdd3978a1e27d',
   'src/third_party':
     Var('chromium_git') + '/chromium/src/third_party' + '@' + '7bb272614570fc27db02e8d0972858146f04feb4',
+  'src/third_party/android_ndk': {
+      'url': Var('chromium_git') + '/android_ndk.git' + '@' + 'e951c37287c7d8cd915bf8d4149fd4a06d808b55',
+      'condition': 'checkout_android',
+  },
   'src/third_party/android_tools': {
     'url': Var('chromium_git') + '/android_tools.git' + '@' + 'c78b25872734e0038ae2a333edc645cd96bc232d',
     'condition': 'checkout_android',