cc: Use BeginFrameArgs

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 30616268f2053ee494aad578457546f0fa88c2d5..fd1c221e3c8a1906493675615747b25ac5627263 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -4,6 +4,7 @@
 
 #include "cc/trees/layer_tree_impl.h"
 
+#include "base/strings/stringprintf.h"
 #include "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
@@ -178,6 +179,12 @@ void LayerTreeImpl::SetPageScaleFactorAndLimits(float page_scale_factor,
 }
 
 void LayerTreeImpl::SetPageScaleDelta(float delta) {
+  std::string str;
+  base::StringAppendF(&str, "%s : delta %f",
+                      __PRETTY_FUNCTION__,
+                      delta);
+  TRACE_EVENT0("cc", str.c_str());
+
   // Clamp to the current min/max limits.
   float total = page_scale_factor_ * delta;
   if (min_page_scale_factor_ && total < min_page_scale_factor_)
@@ -187,7 +194,7 @@ void LayerTreeImpl::SetPageScaleDelta(float delta) {
 
   if (delta == page_scale_delta_)
     return;
-
+TRACE_EVENT0("cc", __PRETTY_FUNCTION__);
   page_scale_delta_ = delta;
 
   if (IsActiveTree()) {