cc: Add main frame timing info to frame timing tracker.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 5114fdcecca669bac2dd4d3f5395f9520d2eb1a9..90b8abcbe75430ae75166630b722ed96dd94eaee 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -34,6 +34,21 @@
 #include "ui/gfx/geometry/vector2d_conversions.h"
 
 namespace cc {
+namespace {
+
+template <typename Lambda>
+void ProcessLayersRecursive(LayerImpl* current, const Lambda& lambda) {

[enne (OOO), 2015/03/06 00:00:57]

This isn't needed anymore, yeah?

[vmpstr, 2015/03/06 00:59:53]

Whoops, removed.

+  DCHECK(current);
+  lambda(current);
+  if (current->mask_layer())
+    ProcessLayersRecursive(current->mask_layer(), lambda);
+  if (current->replica_layer())
+    ProcessLayersRecursive(current->replica_layer(), lambda);
+  for (size_t i = 0; i < current->children().size(); ++i)
+    ProcessLayersRecursive(current->children()[i], lambda);
+}
+
+}  // namespace
 
 // This class exists to split the LayerScrollOffsetDelegate between the
 // InnerViewportScrollLayer and the OuterViewportScrollLayer in a manner
@@ -135,6 +150,20 @@ void LayerTreeImpl::RecreateResources() {
   }
 }
 
+void LayerTreeImpl::GatherFrameTimingRequestIds(
+    std::vector<int64_t>* request_ids) {
+  if (!root_layer_)
+    return;
+
+  // TODO(vmpstr): Early out if there are no requests on any of the layers. For
+  // that, we need to inform LayerTreeImpl whenever there are requests when we
+  // get them.
+  LayerTreeHostCommon::CallFunctionForSubtree(
+      root_layer_.get(), [request_ids](LayerImpl* layer) {
+        layer->GatherFrameTimingRequestIds(request_ids);
+      });
+}
+
 void LayerTreeImpl::SetRootLayer(scoped_ptr<LayerImpl> layer) {
   if (inner_viewport_scroll_layer_)
     inner_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);