cc: Pass Occlusion instead of OcclusionTracker to LayerImpls

cc/layers/io_surface_layer_impl.cc

Index: cc/layers/io_surface_layer_impl.cc
diff --git a/cc/layers/io_surface_layer_impl.cc b/cc/layers/io_surface_layer_impl.cc
index 7cb86ceee8b3070bd61d046fc100c3c8c81b486e..8d221956c61ef82cbc06740deeb3487272fe581a 100644
--- a/cc/layers/io_surface_layer_impl.cc
+++ b/cc/layers/io_surface_layer_impl.cc
@@ -9,7 +9,7 @@
 #include "cc/output/output_surface.h"
 #include "cc/quads/io_surface_draw_quad.h"
 #include "cc/trees/layer_tree_impl.h"
-#include "cc/trees/occlusion_tracker.h"
+#include "cc/trees/occlusion.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "third_party/khronos/GLES2/gl2.h"
@@ -66,7 +66,7 @@ bool IOSurfaceLayerImpl::WillDraw(DrawMode draw_mode,
 
 void IOSurfaceLayerImpl::AppendQuads(
     RenderPass* render_pass,
-    const OcclusionTracker<LayerImpl>& occlusion_tracker,
+    const Occlusion& occlusion_in_content_space,
     AppendQuadsData* append_quads_data) {
   SharedQuadState* shared_quad_state =
       render_pass->CreateAndAppendSharedQuadState();
@@ -78,9 +78,7 @@ void IOSurfaceLayerImpl::AppendQuads(
   gfx::Rect quad_rect(content_bounds());
   gfx::Rect opaque_rect(contents_opaque() ? quad_rect : gfx::Rect());
   gfx::Rect visible_quad_rect =
-      occlusion_tracker.GetCurrentOcclusionForLayer(
-                            draw_properties().target_space_transform)
-          .GetUnoccludedContentRect(quad_rect);
+      occlusion_in_content_space.GetUnoccludedContentRect(quad_rect);
   if (visible_quad_rect.IsEmpty())
     return;