Delay activation/draw on GPU tile work completion

cc/tiles/tile_draw_info.cc

Index: cc/tiles/tile_draw_info.cc
diff --git a/cc/tiles/tile_draw_info.cc b/cc/tiles/tile_draw_info.cc
index 29f2cc833799ebfcb1606126dc4af34111e52909..560345ad3d5a84ea2dbdc7c074988d3604996d0e 100644
--- a/cc/tiles/tile_draw_info.cc
+++ b/cc/tiles/tile_draw_info.cc
@@ -10,11 +10,7 @@
 namespace cc {
 
 TileDrawInfo::TileDrawInfo()
-    : mode_(RESOURCE_MODE),
-      solid_color_(SK_ColorWHITE),
-      resource_(nullptr),
-      contents_swizzled_(false),
-      was_ever_ready_to_draw_(false),
+    : was_ever_ready_to_draw_(false),
       was_ever_used_to_draw_(false),
       was_a_prepaint_tile_(false) {}
 
@@ -32,4 +28,10 @@ void TileDrawInfo::AsValueInto(base::trace_event::TracedValue* state) const {
                     mode_ == SOLID_COLOR_MODE && !SkColorGetA(solid_color_));
 }
 
+Resource* TileDrawInfo::TakeResource() {
+  Resource* resource = resource_;
+  set_resource(nullptr);
+  return resource;
+}
+
 }  // namespace cc