Refactoring for merging ManagedTileState into Tile.

cc/resources/tile_draw_info.cc

Index: cc/resources/tile_draw_info.cc
diff --git a/cc/resources/tile_draw_info.cc b/cc/resources/tile_draw_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..518a74b82ada89c5618fbf1cd4f4589b44da29a7
--- /dev/null
+++ b/cc/resources/tile_draw_info.cc
@@ -0,0 +1,37 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/resources/tile_draw_info.h"
+
+#include "cc/base/math_util.h"
+
+namespace cc {
+
+TileDrawInfo::TileDrawInfo()
+    : mode_(RESOURCE_MODE), solid_color_(SK_ColorWHITE) {
+}
+
+TileDrawInfo::~TileDrawInfo() {
+  DCHECK(!resource_);
+}
+
+bool TileDrawInfo::IsReadyToDraw() const {
+  switch (mode_) {
+    case RESOURCE_MODE:
+      return !!resource_;
+    case SOLID_COLOR_MODE:
+    case PICTURE_PILE_MODE:
+      return true;
+  }
+  NOTREACHED();
+  return false;
+}
+
+void TileDrawInfo::AsValueInto(base::debug::TracedValue* state) const {
+  state->SetBoolean("is_solid_color", mode_ == SOLID_COLOR_MODE);
+  state->SetBoolean("is_transparent",
+                    mode_ == SOLID_COLOR_MODE && !SkColorGetA(solid_color_));
+}
+
+}  // namespace cc