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 248fb6d10c26135192df79f858a166275b872532..d35bc6514ec500a0e0cdd4a44455c7bc04e08401 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
@@ -25,6 +25,8 @@ class MediaPerceptionPrivateGetStateFunction
   // ExtensionFunction:
   ResponseAction Run() override;
 
+  void GetStateCallback(bool succeeded, media_perception::State state);
+
   DISALLOW_COPY_AND_ASSIGN(MediaPerceptionPrivateGetStateFunction);
 };
 
@@ -41,6 +43,8 @@ class MediaPerceptionPrivateSetStateFunction
   // ExtensionFunction:
   ResponseAction Run() override;
 
+  void SetStateCallback(bool succeeded, media_perception::State state);
+
   DISALLOW_COPY_AND_ASSIGN(MediaPerceptionPrivateSetStateFunction);
 };
 
@@ -57,6 +61,9 @@ class MediaPerceptionPrivateGetDiagnosticsFunction
   // ExtensionFunction:
   ResponseAction Run() override;
 
+  void GetDiagnosticsCallback(bool succeeded,
+                              media_perception::Diagnostics diagnostics);
+
   DISALLOW_COPY_AND_ASSIGN(MediaPerceptionPrivateGetDiagnosticsFunction);
 };