Introduce Tile Versions

cc/tile.cc

Index: cc/tile.cc
diff --git a/cc/tile.cc b/cc/tile.cc
index 536b2efc5e6883cff024a7b2464ba9372ec063c2..7c205e88010fd1b7a79087cf694e306e3a945b45 100644
--- a/cc/tile.cc
+++ b/cc/tile.cc
@@ -10,17 +10,60 @@ namespace cc {
 
 Tile::Tile(TileManager* tile_manager,
            gfx::Size tile_size,
+           GLenum format,
            gfx::Rect rect_inside_picture,
            TileQuality quality)
   : tile_manager_(tile_manager),
     tile_size_(tile_size),
+    format_(format),
     rect_inside_picture_(rect_inside_picture),
     quality_(quality) {
-  tile_manager_->RegisterTile(this);
 }
 
 Tile::~Tile() {
-  tile_manager_->UnregisterTile(this);
+  for (size_t i = 0; i < versions_.size(); i++)
+    tile_manager_->DidDeleteTileVersion(versions_[i]);
+  versions_.clear();
+}
+
+void Tile::SetPicturePile(int frame_number, PicturePile* picture_pile) {
+  DCHECK(GetVersion(frame_number) == NULL);
+  TileVersion* version = new TileVersion(this, frame_number, picture_pile);
+  versions_.push_back(version);
+  tile_manager_->DidCreateTileVersion(version);
+}
+
+void Tile::ModifyPriority(int frame_number, const TilePriority& priority) {
+  TileVersion* version = GetVersion(frame_number);
+  DCHECK(version) <<
+    "Tile must have a picture pile before its priority can be modified";
+  tile_manager_->WillModifyTileVersionPriority(version, priority);
+  version->ModifyPriority(priority);
+}
+
+ResourceProvider::ResourceId Tile::GetDrawableResourceId(int frame_number) {
+  TileVersion* version = GetVersion(frame_number);
+  if (!version)
+    return 0;
+  return version->resource_id();
+}
+
+void Tile::DeleteVersionOnRequestOfTileManager(int frame_number) {
+  for (size_t i = 0; i < versions_.size(); i++) {
+    if (versions_[i]->frame_number() == frame_number) {
+      versions_.erase(versions_.begin() + frame_number);
+      return;
+    }
+  }
+  DCHECK(false) << "Could not find version";
+}
+
+TileVersion* Tile::GetVersion(int frame_number) {
+  for (size_t i = 0; i < versions_.size(); i++) {
+    if (versions_[i]->frame_number() == frame_number)
+      return versions_[i];
+  }
+  return NULL;
 }
 
 }  // namespace cc