Refactor trace_event_impl's SetEnabled to use TraceOptions. Propagate this through the whole stack.

content/browser/media/webrtc_getusermedia_browsertest.cc

Index: content/browser/media/webrtc_getusermedia_browsertest.cc
diff --git a/content/browser/media/webrtc_getusermedia_browsertest.cc b/content/browser/media/webrtc_getusermedia_browsertest.cc
index 8af8f45621b1a52f052975c49c4d19a51432134d..9efa23e9b2911d0fa1ff6f17d9b6522043434ece 100644
--- a/content/browser/media/webrtc_getusermedia_browsertest.cc
+++ b/content/browser/media/webrtc_getusermedia_browsertest.cc
@@ -83,9 +83,11 @@ class WebRtcGetUserMediaBrowserTest: public WebRtcContentBrowserTest {
   void StartTracing() {
     CHECK(trace_log_ == NULL) << "Can only can start tracing once";
     trace_log_ = base::debug::TraceLog::GetInstance();
+    base::debug::TraceOptions trace_options(base::debug::RECORD_UNTIL_FULL);
+    trace_options.enable_sampling = true;
     trace_log_->SetEnabled(base::debug::CategoryFilter("video"),
                            base::debug::TraceLog::RECORDING_MODE,
-                           base::debug::TraceLog::ENABLE_SAMPLING);
+                           trace_options);
     // Check that we are indeed recording.
     EXPECT_EQ(trace_log_->GetNumTracesRecorded(), 1);
   }