Implement on demand quad rasterization for PicturePiles.

cc/quads/draw_quad.cc

Index: cc/quads/draw_quad.cc
diff --git a/cc/quads/draw_quad.cc b/cc/quads/draw_quad.cc
index 22271d63770d623aadcfa8061ecf48623194d7ad..36756a77c0cfa85d638395ded5f2fd254683de32 100644
--- a/cc/quads/draw_quad.cc
+++ b/cc/quads/draw_quad.cc
@@ -8,6 +8,7 @@
 #include "cc/quads/checkerboard_draw_quad.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/io_surface_draw_quad.h"
+#include "cc/quads/picture_draw_quad.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/stream_video_draw_quad.h"
@@ -64,6 +65,9 @@ scoped_ptr<DrawQuad> DrawQuad::Copy(
     case IO_SURFACE_CONTENT:
       copy_quad.reset(TypedCopy<IOSurfaceDrawQuad>(this));
       break;
+    case PICTURE_CONTENT:
+      copy_quad.reset(TypedCopy<PictureDrawQuad>(this));
+      break;
     case TEXTURE_CONTENT:
       copy_quad.reset(TypedCopy<TextureDrawQuad>(this));
       break;