cc: Use asynchronous set pixels API for impl-side painting.

cc/tile.cc

Index: cc/tile.cc
diff --git a/cc/tile.cc b/cc/tile.cc
index 1b04a5dac5288a84394f67a317614370c48ca710..9ebaa51793a30509a6d7b5fdad6d4e4a0e16e343 100644
--- a/cc/tile.cc
+++ b/cc/tile.cc
@@ -33,6 +33,15 @@ void Tile::set_priority(WhichTree tree, const TilePriority& priority) {
   priority_[tree] = priority;
 }
 
+ResourceProvider::ResourceId Tile::GetResourceId() const {
+  if (!managed_state_.resource)
+    return 0;
+  if (managed_state_.resource_is_being_initialized)
+    return 0;
+
+  return managed_state_.resource->id();
+}
+
 size_t Tile::bytes_consumed_if_allocated() const {
   DCHECK(format_ == GL_RGBA);
   return 4 * tile_size_.width() * tile_size_.height();