[cc] Track the rendering & painting cost of impl-side painting.

cc/picture_layer_impl.cc.rej

Index: cc/picture_layer_impl.cc.rej
diff --git a/cc/picture_layer_impl.cc.rej b/cc/picture_layer_impl.cc.rej
new file mode 100644
index 0000000000000000000000000000000000000000..bfda845c9c694a467d9e282758209dd7694b509e
--- /dev/null
+++ b/cc/picture_layer_impl.cc.rej
@@ -0,0 +1,34 @@
+***************
+*** 4,9 ****
+  
+  #include "cc/picture_layer_impl.h"
+  
+  #include "cc/layer_tree_host_impl.h"
+  #include "cc/math_util.h"
+  #include "cc/quad_sink.h"
+--- 4,10 ----
+  
+  #include "cc/picture_layer_impl.h"
+  
++ #include "base/time.h"
+  #include "cc/layer_tree_host_impl.h"
+  #include "cc/math_util.h"
+  #include "cc/quad_sink.h"
+***************
+*** 13,19 ****
+  
+  PictureLayerImpl::PictureLayerImpl(int id) :
+      LayerImpl(id),
+-     tilings_(this) {
+  }
+  
+  PictureLayerImpl::~PictureLayerImpl() {
+--- 14,21 ----
+  
+  PictureLayerImpl::PictureLayerImpl(int id) :
+      LayerImpl(id),
++     tilings_(this),
++     last_update_time_(0) {
+  }
+  
+  PictureLayerImpl::~PictureLayerImpl() {