MediaPerceptionPrivate API impl and testing.

extensions/browser/api/media_perception_private/media_perception_private_api.h

Index: extensions/browser/api/media_perception_private/media_perception_private_api.h
diff --git a/extensions/browser/api/media_perception_private/media_perception_private_api.h b/extensions/browser/api/media_perception_private/media_perception_private_api.h
index c3c206c0df23837aa207432b20591fe6085f05f0..3528a50f60b8a6c4d55b42d2c7a7a8015966f1cf 100644
--- a/extensions/browser/api/media_perception_private/media_perception_private_api.h
+++ b/extensions/browser/api/media_perception_private/media_perception_private_api.h
@@ -5,6 +5,7 @@
 #ifndef EXTENSIONS_BROWSER_API_MEDIA_PERCEPTION_PRIVATE_MEDIA_PERCEPTION_PRIVATE_API_H_
 #define EXTENSIONS_BROWSER_API_MEDIA_PERCEPTION_PRIVATE_MEDIA_PERCEPTION_PRIVATE_API_H_
 
+#include "extensions/browser/api/media_perception_private/media_perception_api_manager.h"
 #include "extensions/browser/extension_function.h"
 #include "extensions/common/api/media_perception_private.h"
 
@@ -23,6 +24,9 @@ class MediaPerceptionPrivateGetStateFunction
   // ExtensionFunction:
   ResponseAction Run() override;
 
+  void GetStateCallback(MediaPerceptionAPIManager::CallbackStatus status,
+                        extensions::api::media_perception_private::State state);
+
   DISALLOW_COPY_AND_ASSIGN(MediaPerceptionPrivateGetStateFunction);
 };
 
@@ -39,6 +43,9 @@ class MediaPerceptionPrivateSetStateFunction
   // ExtensionFunction:
   ResponseAction Run() override;
 
+  void SetStateCallback(MediaPerceptionAPIManager::CallbackStatus status,
+                        extensions::api::media_perception_private::State state);
+
   DISALLOW_COPY_AND_ASSIGN(MediaPerceptionPrivateSetStateFunction);
 };
 
@@ -55,6 +62,10 @@ class MediaPerceptionPrivateGetDiagnosticsFunction
   // ExtensionFunction:
   ResponseAction Run() override;
 
+  void GetDiagnosticsCallback(
+      MediaPerceptionAPIManager::CallbackStatus status,
+      extensions::api::media_perception_private::Diagnostics diagnostics);
+
   DISALLOW_COPY_AND_ASSIGN(MediaPerceptionPrivateGetDiagnosticsFunction);
 };