Plumb resize notifications around sky/shell

sky/shell/gpu_delegate.cc

Index: sky/shell/gpu_delegate.cc
diff --git a/sky/compositor/rasterizer.cc b/sky/shell/gpu_delegate.cc
similarity index 66%
copy from sky/compositor/rasterizer.cc
copy to sky/shell/gpu_delegate.cc
index e0eb2d5c189c617e86582c3b774a6fa35e23af65..62fe84c40bc9274136ef867093f5f6a7e872588f 100644
--- a/sky/compositor/rasterizer.cc
+++ b/sky/shell/gpu_delegate.cc
@@ -2,14 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "sky/compositor/rasterizer.h"
+#include "sky/shell/gpu_delegate.h"
 
 namespace sky {
+namespace shell {
 
-Rasterizer::Rasterizer() {
-}
-
-Rasterizer::~Rasterizer() {
+GPUDelegate::~GPUDelegate() {
 }
 
+}  // namespace shell
 }  // namespace sky