Added a query function for whether submodules are enabled

webrtc/modules/audio_processing/echo_control_mobile_impl.h

Index: webrtc/modules/audio_processing/echo_control_mobile_impl.h
diff --git a/webrtc/modules/audio_processing/echo_control_mobile_impl.h b/webrtc/modules/audio_processing/echo_control_mobile_impl.h
index c59a69610dd893b6fb121795f60b0aadd59608a0..97e24075def88a10a19786d62b977a7463ca4e34 100644
--- a/webrtc/modules/audio_processing/echo_control_mobile_impl.h
+++ b/webrtc/modules/audio_processing/echo_control_mobile_impl.h
@@ -43,6 +43,11 @@ class EchoControlMobileImpl : public EchoControlMobile {
                   size_t num_reverse_channels,
                   size_t num_output_channels);
 
+  // Checks whether the module is enabled. Must only be
+  // called from the render side of APM as otherwise
+  // deadlocks may occur.
+  bool is_enabled_render_side_query() const;
+
   // Reads render side data that has been queued on the render call.
   void ReadQueuedRenderData();