Add tracing for browser controls state

Bug: 861618
Change-Id: If5f91df67aa66a1292073f051fb551b9193b7078
Reviewed-on: https://chromium-review.googlesource.com/c/1305297Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603603}

content/renderer/render_view_impl.cc

@@ -1739,6 +1739,12 @@ void RenderViewImpl::UpdateBrowserControlsState(
     BrowserControlsState constraints,
     BrowserControlsState current,
     bool animate) {
+  TRACE_EVENT2("renderer", "RenderViewImpl::UpdateBrowserControlsState",
+               "Constraint", static_cast<int>(constraints), "Current",
+               static_cast<int>(current));
+  TRACE_EVENT_INSTANT1("renderer", "is_animated", TRACE_EVENT_SCOPE_THREAD,
+                       "animated", animate);
+
   if (GetWidget() && GetWidget()->layer_tree_view()) {
     GetWidget()->layer_tree_view()->UpdateBrowserControlsState(
         ContentToCc(constraints), ContentToCc(current), animate);