Change ui::wm::Shadow to use cc::NinePatchLayer.

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index c1767422163a523d837632b6183a6100b5dab2cc..db40f77f4c1197e0c83e1d3fa89698a79d29110d 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -14,6 +14,7 @@
 #include "cc/base/scoped_ptr_algorithm.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/delegated_renderer_layer.h"
+#include "cc/layers/nine_patch_layer.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/layers/texture_layer.h"
@@ -583,10 +584,32 @@ void Layer::SetShowPaintedContent() {
   RecomputeDrawsContentAndUVRect();
 }
 
+void Layer::UpdateNinePatchLayerBitmap(const SkBitmap& bitmap,
+                                       const gfx::Rect& aperture) {
+  DCHECK(type_ == LAYER_NINE_PATCH && nine_patch_layer_.get());
+  SkBitmap bitmap_copy;
+  if (bitmap.isImmutable()) {
+    bitmap_copy = bitmap;
+  } else {
+    // UIResourceBitmap requires an immutable copy of the input |bitmap|.
+    bitmap.copyTo(&bitmap_copy);
+    bitmap_copy.setImmutable();
+  }
+  nine_patch_layer_->SetBitmap(bitmap_copy);
+  nine_patch_layer_->SetAperture(aperture);
+}
+
+void Layer::UpdateNinePatchLayerBorder(const gfx::Rect& border) {
+  DCHECK(type_ == LAYER_NINE_PATCH && nine_patch_layer_.get());
+  nine_patch_layer_->SetBorder(border);
+}
+
 void Layer::SetColor(SkColor color) { GetAnimator()->SetColor(color); }
 
 bool Layer::SchedulePaint(const gfx::Rect& invalid_rect) {
-  if (type_ == LAYER_SOLID_COLOR || (!delegate_ && !mailbox_.IsValid()))
+  if (type_ == LAYER_SOLID_COLOR ||
+      type_ == LAYER_NINE_PATCH ||
+      (!delegate_ && !mailbox_.IsValid()))
     return false;
 
   damaged_region_.op(invalid_rect.x(),
@@ -927,6 +950,9 @@ void Layer::CreateWebLayer() {
   if (type_ == LAYER_SOLID_COLOR) {
     solid_color_layer_ = cc::SolidColorLayer::Create();
     cc_layer_ = solid_color_layer_.get();
+  } else if (type_ == LAYER_NINE_PATCH) {
+    nine_patch_layer_ = cc::NinePatchLayer::Create();
+    cc_layer_ = nine_patch_layer_.get();
   } else {
     if (Layer::UsingPictureLayer())
       content_layer_ = cc::PictureLayer::Create(this);