Make 'webrtc' a static library.

webrtc/build/no_op_function.cc

Index: webrtc/build/no_op_function.cc
diff --git a/webrtc/modules/desktop_capture/screen_drawer_mac.cc b/webrtc/build/no_op_function.cc
similarity index 62%
copy from webrtc/modules/desktop_capture/screen_drawer_mac.cc
copy to webrtc/build/no_op_function.cc
index 1d0437b5a1022b26afaa5942d6abe76066fe455b..4c10e37d39f9b4c89769b7ee72a8357d48156d26 100644
--- a/webrtc/modules/desktop_capture/screen_drawer_mac.cc
+++ b/webrtc/build/no_op_function.cc
@@ -8,15 +8,16 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-// TODO(zijiehe): Implement ScreenDrawerMac
-
-#include "webrtc/modules/desktop_capture/screen_drawer.h"
-
 namespace webrtc {
 
-// static
-std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() {
-  return nullptr;
+// TODO(kjellander): Remove this whenever possible. GN's static_library
+// target type requires at least one object to avoid errors linking.
+
+// No-op function that can be used to compile an object necessary
+// for linking into a static library.
+int foobarbaz() {
+  return 0;
 }
 
 }  // namespace webrtc
+