Add SwapPromise support to LayerTreeHost and LayerTreeImpl

cc/base/swap_promise.cc

Index: cc/base/swap_promise.cc
diff --git a/ui/gfx/render_text_ozone.cc b/cc/base/swap_promise.cc
similarity index 57%
copy from ui/gfx/render_text_ozone.cc
copy to cc/base/swap_promise.cc
index 058b5a6389dd1dd3d822a3615c469a66d9aec1c2..5d169d45535fdc8dbfdabc668d07980e65c9131d 100644
--- a/ui/gfx/render_text_ozone.cc
+++ b/cc/base/swap_promise.cc
@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gfx/render_text.h"
+#include "cc/base/swap_promise.h"
 

[Yufeng Shen (Slow to review), 2013/11/14 22:09:55]

Please ignore that this file is replacing ui/gfx/render_text_ozone.cc.

Locally I only create the swap_promise.cc but when I git upload, it appears this
file is replacing mysteriously
ui/gfx/render_text_ozone.cc.
I will figure this out.

-namespace gfx {
+namespace cc {
 
-RenderText* RenderText::CreateInstance() {
-  return NULL;
+SwapPromise::SwapPromise(SwapPromiseType type) : type_(type) {
 }
 
-}  // namespace gfx
+}  // namespace cc