[cc] Trace detailed tile info when --trace-all-rendered-frames

cc/picture_layer_tiling.cc

Index: cc/picture_layer_tiling.cc
diff --git a/cc/picture_layer_tiling.cc b/cc/picture_layer_tiling.cc
index ae3afc39d0451f79f96449138fba168f8f90ae2a..a1b4d208b33eba62230de9e13cc083c15c39a507 100644
--- a/cc/picture_layer_tiling.cc
+++ b/cc/picture_layer_tiling.cc
@@ -11,8 +11,16 @@
 #include "ui/gfx/safe_integer_conversions.h"
 #include "ui/gfx/size_conversions.h"
 
+namespace {
+static bool store_screen_space_quads_on_tiles = false;

[enne (OOO), 2013/02/12 00:21:13]

I agree with Shawn that this isn't great as a static.  Make this a
LayerTreeSetting and just set it as a local member on the tiling itself when you
create it from PictureLayerImpl.

+}
+
 namespace cc {
 
+void PictureLayerTiling::SetStoreScrenSpaceQuadsOnTiles(bool b) {

[enne (OOO), 2013/02/12 00:21:13]

Can you use a better variable name than b?

+  store_screen_space_quads_on_tiles = b;
+}
+
 scoped_ptr<PictureLayerTiling> PictureLayerTiling::Create(
     float contents_scale) {
   return make_scoped_ptr(new PictureLayerTiling(contents_scale));
@@ -443,6 +451,13 @@ void PictureLayerTiling::UpdateTilePriorities(
           resolution_,
           time_to_visible_in_seconds,
           distance_to_visible_in_pixels);
+      if (store_screen_space_quads_on_tiles) {
+        bool clipped;
+        priority.set_current_screen_quad(
+            MathUtil::projectQuad(current_screen_transform,

[enne (OOO), 2013/02/12 00:21:13]

In this case, you can just set_current_screen_quad(current_screen_rect) rather
than doing a projection.

+                                  gfx::QuadF(tile_bounds),
+                                  clipped));
+      }
       tile->set_priority(tree, priority);
     }
   }
@@ -481,6 +496,13 @@ void PictureLayerTiling::UpdateTilePriorities(
           resolution_,
           time_to_visible_in_seconds,
           distance_to_visible_in_pixels);
+      if (store_screen_space_quads_on_tiles) {
+        bool clipped;
+        priority.set_current_screen_quad(
+            MathUtil::projectQuad(current_screen_transform,
+                                  gfx::QuadF(tile_bounds),

[enne (OOO), 2013/02/12 00:21:13]

Here's your low res issue: s/tile_bounds/current_layer_content_rect/.  The same
issue applies above, although you don't have to do a projection there.

+                                  clipped));
+      }
       tile->set_priority(tree, priority);
     }
   }