[not for review] Add Draw entries to window Performance Timeline

cc/trees/layer_tree_host_common.h

Index: cc/trees/layer_tree_host_common.h
diff --git a/cc/trees/layer_tree_host_common.h b/cc/trees/layer_tree_host_common.h
index 0e139471739b57657baf2008aaa2914a225eeaeb..42458eebc0b55d4b066c22ef79d3c2fa50e17c56 100644
--- a/cc/trees/layer_tree_host_common.h
+++ b/cc/trees/layer_tree_host_common.h
@@ -6,10 +6,12 @@
 #define CC_TREES_LAYER_TREE_HOST_COMMON_H_
 
 #include <limits>
+#include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/layers/layer_lists.h"
@@ -131,6 +133,13 @@ class CC_EXPORT LayerTreeHostCommon {
     int layer_id;
     gfx::Vector2d scroll_delta;
   };
+
+  struct DrawTimingInfo {
+    DrawTimingInfo();
+    ~DrawTimingInfo();
+    int64_t rect_id;
+    std::vector<std::pair<int, base::TimeTicks> > timestamps;
+  };
 };
 
 struct CC_EXPORT ScrollAndScaleSet {
@@ -141,6 +150,13 @@ struct CC_EXPORT ScrollAndScaleSet {
   float page_scale_delta;
 };
 
+struct CC_EXPORT DrawTimingSet {
+  DrawTimingSet();
+  ~DrawTimingSet();
+
+  std::vector<LayerTreeHostCommon::DrawTimingInfo> draws;
+};
+
 template <typename LayerType>
 bool LayerTreeHostCommon::RenderSurfaceContributesToTarget(
     LayerType* layer,