Changing echo_path_size_bytes() to static, and using size_t rather than int. This is recommended by Chromium:

http://www.chromium.org/developers/coding-style

Fixing a few compile warnings.
Review URL: http://webrtc-codereview.appspot.com/81001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@228 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/audio_processing/main/interface/audio_processing.h

@@ -11,6 +11,8 @@
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_INTERFACE_AUDIO_PROCESSING_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_INTERFACE_AUDIO_PROCESSING_H_
 
+#include <stddef.h> // size_t
+
 #include "typedefs.h"
 #include "module.h"
 
@@ -357,18 +359,24 @@ class EchoControlMobile {
   virtual bool is_comfort_noise_enabled() const = 0;
 
   // A typical use case is to initialize the component with an echo path from a
-  // previous call. The echo path is retrieved using |GetEchoPath()| typically
-  // at the end of a call. The data can then be stored for later use as
-  // initializer, using |SetEchoPath()|.
+  // previous call. The echo path is retrieved using |GetEchoPath()|, typically
+  // at the end of a call. The data can then be stored for later use as an
+  // initializer before the next call, using |SetEchoPath()|.
+  //
   // Controlling the echo path this way requires the data |size_bytes| to match
   // the internal echo path size. This size can be acquired using
   // |echo_path_size_bytes()|. |SetEchoPath()| causes an entire reset, worth
-  // noting if it is to be called during an ongoing call. It is possible that
-  // version incompatibilities may result in a stored echo path of the
-  // incorrect size. In this case, the stored path should be discarded.
-  virtual int SetEchoPath(const void* echo_path, int size_bytes) = 0;
-  virtual int GetEchoPath(void* echo_path, int size_bytes) const = 0;
-  virtual const int echo_path_size_bytes() const = 0;
+  // noting if it is to be called during an ongoing call.
+  //
+  // It is possible that version incompatibilities may result in a stored echo
+  // path of the incorrect size. In this case, the stored path should be
+  // discarded.
+  virtual int SetEchoPath(const void* echo_path, size_t size_bytes) = 0;
+  virtual int GetEchoPath(void* echo_path, size_t size_bytes) const = 0;
+
+  // The returned path size is guaranteed not to change for the lifetime of
+  // the application.
+  static size_t echo_path_size_bytes();
 
  protected:
   virtual ~EchoControlMobile() {};