Adding method IsInBeam to beamformer class.

webrtc/modules/audio_processing/beamformer/beamformer.h

Index: webrtc/modules/audio_processing/beamformer/beamformer.h
diff --git a/webrtc/modules/audio_processing/beamformer/beamformer.h b/webrtc/modules/audio_processing/beamformer/beamformer.h
index 04cb659c6d346954e23feef5af5613cbfa4af5e3..ff5b034a8cd83fd65f63105f404108606335aa4f 100644
--- a/webrtc/modules/audio_processing/beamformer/beamformer.h
+++ b/webrtc/modules/audio_processing/beamformer/beamformer.h
@@ -31,6 +31,9 @@ class Beamformer {
   // Needs to be called before the the Beamformer can be used.
   virtual void Initialize(int chunk_size_ms, int sample_rate_hz) = 0;
 
+  // Indicates whether a given point is inside of the beam.
+  virtual bool IsInBeam(const SphericalPointf& spherical_point) { return true; }
+
   // Returns true if the current data contains the target signal.
   // Which signals are considered "targets" is implementation dependent.
   virtual bool is_target_present() = 0;