Implement on demand quad rasterization for PicturePiles.

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 153a240f1b703026f217145205902de16e59cece..7429178dbcf2884c1fb37cb5fb2b542fa783047f 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -614,6 +614,7 @@ void TileManager::AssignGpuMemoryToTiles() {
           mts.bin[LOW_PRIORITY_BIN] == NOW_BIN)
           bytes_that_exceeded_memory_budget_in_now_bin += tile_bytes;
       FreeResourcesForTile(tile);

[nduca, 2013/03/21 02:22:48]

so um, where is the part of this loop that says "please use texgture mode?" I
dont see it... what happens if a tile gets rasterize on demand one fram, but
gets to line 620 on the next frame?

[Leandro Graciá Gil, 2013/03/21 03:35:50]

I don't see any specific consequences of that. If it gets to line 620 it will
work as it currently does. What do you exactly mean?

[vmpstr, 2013/03/21 16:34:11]

If tile->drawing_info().mode() is set to PICTURE_PILE_MODE, then it would not be
unset anywhere: this means that we will always rasterize on demand. I think
after this if-block we want to set the mode to TEXTURE_MODE

[Leandro Graciá Gil, 2013/03/21 16:42:48]

I see your point. Fixed.

+      tile->drawing_info().set_rasterize_on_demand();
       continue;
     }
     bytes_left -= tile_bytes;