Reland "Add check_deps rules in DEPS files."

Relanding https://codereview.webrtc.org/1796413002/
without the change to the openmax_dl include path
(which broke downstream code).

TBR=tommi@webrtc.org
BUG=webrtc:5623
TESTED=Passing runs using:
buildtools/checkdeps/checkdeps.py --root=. talk
buildtools/checkdeps/checkdeps.py --root=. webrtc

Review URL: https://codereview.webrtc.org/1804333002 .

Cr-Commit-Position: refs/heads/master@{#12031}
diff --git a/webrtc/modules/video_coding/DEPS b/webrtc/modules/video_coding/DEPS
new file mode 100644
index 0000000..512a0d8
--- /dev/null
+++ b/webrtc/modules/video_coding/DEPS
@@ -0,0 +1,9 @@
+include_rules = [
+  "+third_party/ffmpeg",
+  "+third_party/openh264",
+  "+vpx",
+  "+webrtc/base",
+  "+webrtc/common_video",
+  "+webrtc/system_wrappers",
+  "+webrtc/tools",
+]
diff --git a/webrtc/modules/video_coding/codecs/vp8/screenshare_layers_unittest.cc b/webrtc/modules/video_coding/codecs/vp8/screenshare_layers_unittest.cc
index 3117e49..7be4eb1 100644
--- a/webrtc/modules/video_coding/codecs/vp8/screenshare_layers_unittest.cc
+++ b/webrtc/modules/video_coding/codecs/vp8/screenshare_layers_unittest.cc
@@ -11,7 +11,7 @@
 #include <memory>
 #include <vector>
 
-#include "gtest/gtest.h"
+#include "testing/gtest/include/gtest/gtest.h"
 #include "vpx/vpx_encoder.h"
 #include "vpx/vp8cx.h"
 #include "webrtc/modules/video_coding/include/video_codec_interface.h"
diff --git a/webrtc/modules/video_coding/codecs/vp8/simulcast_unittest.h b/webrtc/modules/video_coding/codecs/vp8/simulcast_unittest.h
index 9f0dc5c..2b2aa5d 100644
--- a/webrtc/modules/video_coding/codecs/vp8/simulcast_unittest.h
+++ b/webrtc/modules/video_coding/codecs/vp8/simulcast_unittest.h
@@ -15,6 +15,7 @@
 #include <memory>
 #include <vector>
 
+#include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/modules/video_coding/include/mock/mock_video_codec_interface.h"
@@ -22,8 +23,6 @@
 #include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
 #include "webrtc/video_frame.h"
 
-#include "gtest/gtest.h"
-
 using ::testing::_;
 using ::testing::AllOf;
 using ::testing::Field;