Add a mechanism to let TracingController invoke JavaScript via TracingUI

content/public/browser/tracing_controller.h

Index: content/public/browser/tracing_controller.h
diff --git a/content/public/browser/tracing_controller.h b/content/public/browser/tracing_controller.h
index 68184a5a844deaa2cb752643ccfb6a1e57fe011d..6291337b84e747eb682c1f61f5e58fa6d12305bd 100644
--- a/content/public/browser/tracing_controller.h
+++ b/content/public/browser/tracing_controller.h
@@ -18,6 +18,7 @@ class FilePath;
 namespace content {
 
 class TracingController;
+class TracingUI;
 
 // TracingController is used on the browser processes to enable/disable
 // trace status and collect trace data. Only the browser UI thread is allowed
@@ -161,6 +162,10 @@ class TracingController {
   // watch event callback.
   virtual bool CancelWatchEvent() = 0;
 
+  // Register/Unregister tracing UI that is using this TracingController.
+  virtual void RegisterTracingUI(TracingUI* tracing_ui) = 0;

[jam, 2014/01/09 18:11:45]

since these are methods called internally from content, they shold go on
TracingControllerImpl instead of the public interface. see
http://www.chromium.org/developers/content-module/content-api

[haraken, 2014/01/10 01:02:38]

Thanks, removed from public APIs.

+  virtual void UnregisterTracingUI(TracingUI* tracing_ui) = 0;
+
  protected:
   virtual ~TracingController() {}
 };