Histogram to track missing and incomplete tiles

cc/layers/append_quads_data.h

Index: cc/layers/append_quads_data.h
diff --git a/cc/layers/append_quads_data.h b/cc/layers/append_quads_data.h
index 7c6768f6630ea9480d604274c65c59de1bdfd774..6a793ace1decbd1e296ee7dfa2d7ab30e4540652 100644
--- a/cc/layers/append_quads_data.h
+++ b/cc/layers/append_quads_data.h
@@ -13,6 +13,7 @@ namespace cc {
 struct AppendQuadsData {
   AppendQuadsData()
       : had_incomplete_tile(false),

[danakj, 2014/07/03 16:01:45]

do we need this one anymore? Just check if num is > 0?

[weiliangc, 2014/07/04 21:35:52]

Done.

+        num_incomplete_tiles(0),
         num_missing_tiles(0),
         visible_content_area(0),
         approximated_visible_content_area(0),
@@ -20,6 +21,7 @@ struct AppendQuadsData {
 
   explicit AppendQuadsData(RenderPass::Id render_pass_id)
       : had_incomplete_tile(false),
+        num_incomplete_tiles(0),
         num_missing_tiles(0),
         visible_content_area(0),
         approximated_visible_content_area(0),
@@ -28,6 +30,8 @@ struct AppendQuadsData {
   // Set by the layer appending quads.
   bool had_incomplete_tile;
   // Set by the layer appending quads.
+  int64 num_incomplete_tiles;
+  // Set by the layer appending quads.
   int64 num_missing_tiles;
   // Set by the layer appending quads.
   int64 visible_content_area;