cc: nine patch: add occlusion support

cc/layers/nine_patch_layer_impl.h

Index: cc/layers/nine_patch_layer_impl.h
diff --git a/cc/layers/nine_patch_layer_impl.h b/cc/layers/nine_patch_layer_impl.h
index 539d8e717aed319b6c88bfc6c1e73f727b3a9308..78180cf645124e721103c7d1b0cc0e5df9e52fbe 100644
--- a/cc/layers/nine_patch_layer_impl.h
+++ b/cc/layers/nine_patch_layer_impl.h
@@ -54,10 +54,12 @@ class CC_EXPORT NinePatchLayerImpl : public UIResourceLayerImpl {
   // |image_aperture| = (X, Y, P, Q)
   // |border| = (A, C, A + B, C + D)
   // |fill_center| indicates whether to draw the center quad or not.
+  // |occlusion_rectangle|

[Daniel Erat, 2016/04/15 15:38:45]

this comment doesn't do much good on its own. :-P please describe it in terms of
the above diagrams, like the other parameters are described.

[llandwerlin-old, 2016/04/18 15:08:20]

Done.

   void SetLayout(const gfx::Rect& image_aperture,
                  const gfx::Rect& border,
                  bool fill_center,
-                 bool nearest_neighbor);
+                 bool nearest_neighbor,
+                 const gfx::Rect& layer_occlusion);
 
   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
   void PushPropertiesTo(LayerImpl* layer) override;
@@ -75,6 +77,17 @@ class CC_EXPORT NinePatchLayerImpl : public UIResourceLayerImpl {
 
   void CheckGeometryLimitations();
 
+  void AppendQuadsWithOcclusion(RenderPass* render_pass,
+                                ResourceId resource,
+                                SharedQuadState* shared_quad_state,
+                                std::vector<gfx::Rect>* image_rects,
+                                std::vector<gfx::Rect>* layer_rects);
+  void AppendQuadsWithoutOcclusion(RenderPass* render_pass,
+                                   ResourceId resource,
+                                   SharedQuadState* shared_quad_state,
+                                   std::vector<gfx::Rect>* image_rects,
+                                   std::vector<gfx::Rect>* layer_rects);
+
   // The transparent center region that shows the parent layer's contents in
   // image space.
   gfx::Rect image_aperture_;
@@ -86,6 +99,8 @@ class CC_EXPORT NinePatchLayerImpl : public UIResourceLayerImpl {
 
   bool nearest_neighbor_;
 
+  gfx::Rect layer_occlusion_;
+
   DISALLOW_COPY_AND_ASSIGN(NinePatchLayerImpl);
 };