Build WebRTC with data channel only.

webrtc/sdk/android/src/jni/androidhistogram_jni.cc

Index: webrtc/sdk/android/src/jni/androidhistogram_jni.cc
diff --git a/webrtc/sdk/android/src/jni/androidhistogram_jni.cc b/webrtc/sdk/android/src/jni/androidhistogram_jni.cc
index 74ddcfbb58c596ceff97dfa9167c13845f64e70a..b3c05960857e64797f654fcb06b937b70c59d08b 100644
--- a/webrtc/sdk/android/src/jni/androidhistogram_jni.cc
+++ b/webrtc/sdk/android/src/jni/androidhistogram_jni.cc
@@ -13,7 +13,11 @@
 
 #include "webrtc/sdk/android/src/jni/classreferenceholder.h"
 #include "webrtc/sdk/android/src/jni/jni_helpers.h"
-#include "webrtc/sdk/android/src/jni/native_handle_impl.h"
+
+#if defined(HAVE_WEBRTC_VOICE) && defined(HAVE_WEBRTC_VIDEO)
+#include "webrtc/sdk/android/src/jni/native_handle_impl.h"  // nogncheck

[sakal, 2017/05/11 11:06:12]

I don't see why this should be here at all. Maybe it was added by accident? Can
you try removing it?

[Zhi Huang, 2017/05/12 20:05:33]

Because we don't want to depend on "native_handle_impl.h" in
datachannel_only_jni target. Though I've add this in the peerconneciton_jni.cc,
it seems that this "//nogncheck" only scoped per file.

In short, "gn gen out/Debug --check" would fail without it.

+#endif
+
 #include "webrtc/system_wrappers/include/metrics.h"
 
 // Enables collection of native histograms and creating them.