mandoline: Add automatic tracing at mojo call sites.

components/web_view/frame_connection.cc

Index: components/web_view/frame_connection.cc
diff --git a/components/web_view/frame_connection.cc b/components/web_view/frame_connection.cc
index 042aa1df74d41bee43803e647c0060db759d2e14..68d8fc082b59cf19fe9bbe015bf89f4e2d6b2685 100644
--- a/components/web_view/frame_connection.cc
+++ b/components/web_view/frame_connection.cc
@@ -91,6 +91,7 @@ void FrameConnection::Init(mojo::ApplicationImpl* app,
 
   mojo::Array<mojo::String> tracing_interfaces;
   tracing_interfaces.push_back(tracing::StartupPerformanceDataCollector::Name_);
+  tracing_interfaces.push_back(tracing::TraceCollector::Name_);
   filter->filter.insert("mojo:tracing", tracing_interfaces.Pass());
 
   mojo::Array<mojo::String> window_manager_interfaces;