Revert of cc: Add occlusion checker as a fixed view of occlusion tracker.

cc/resources/picture_layer_tiling_perftest.cc

Index: cc/resources/picture_layer_tiling_perftest.cc
diff --git a/cc/resources/picture_layer_tiling_perftest.cc b/cc/resources/picture_layer_tiling_perftest.cc
index f1b462f3f8665da33dda1bda6d10421a684ba734..00338abaefea33cb166971d6c5f3e5ff1ddb061f 100644
--- a/cc/resources/picture_layer_tiling_perftest.cc
+++ b/cc/resources/picture_layer_tiling_perftest.cc
@@ -74,8 +74,13 @@
 
     timer_.Reset();
     do {
-      picture_layer_tiling_->UpdateTilePriorities(
-          PENDING_TREE, viewport_rect, 1.f, timer_.NumLaps() + 1, Occlusion());
+      picture_layer_tiling_->UpdateTilePriorities(PENDING_TREE,
+                                                  viewport_rect,
+                                                  1.f,
+                                                  timer_.NumLaps() + 1,
+                                                  NULL,
+                                                  NULL,
+                                                  gfx::Transform());
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());
 
@@ -99,8 +104,13 @@
 
     timer_.Reset();
     do {
-      picture_layer_tiling_->UpdateTilePriorities(
-          PENDING_TREE, viewport_rect, 1.f, timer_.NumLaps() + 1, Occlusion());
+      picture_layer_tiling_->UpdateTilePriorities(PENDING_TREE,
+                                                  viewport_rect,
+                                                  1.f,
+                                                  timer_.NumLaps() + 1,
+                                                  NULL,
+                                                  NULL,
+                                                  gfx::Transform());
 
       viewport_rect = gfx::Rect(viewport_rect.x() + xoffsets[offsetIndex],
                                 viewport_rect.y() + yoffsets[offsetIndex],
@@ -129,7 +139,7 @@
         PictureLayerTiling::Create(1, bounds, &picture_layer_tiling_client_);
     picture_layer_tiling_client_.set_tree(ACTIVE_TREE);
     picture_layer_tiling_->UpdateTilePriorities(
-        ACTIVE_TREE, viewport, 1.0f, 1.0, Occlusion());
+        ACTIVE_TREE, viewport, 1.0f, 1.0, NULL, NULL, gfx::Transform());
 
     timer_.Reset();
     do {
@@ -154,7 +164,7 @@
         PictureLayerTiling::Create(1, bounds, &picture_layer_tiling_client_);
     picture_layer_tiling_client_.set_tree(ACTIVE_TREE);
     picture_layer_tiling_->UpdateTilePriorities(
-        ACTIVE_TREE, viewport, 1.0f, 1.0, Occlusion());
+        ACTIVE_TREE, viewport, 1.0f, 1.0, NULL, NULL, gfx::Transform());
 
     timer_.Reset();
     do {
@@ -184,7 +194,7 @@
         PictureLayerTiling::Create(1, bounds, &picture_layer_tiling_client_);
     picture_layer_tiling_client_.set_tree(ACTIVE_TREE);
     picture_layer_tiling_->UpdateTilePriorities(
-        ACTIVE_TREE, viewport, 1.0f, 1.0, Occlusion());
+        ACTIVE_TREE, viewport, 1.0f, 1.0, NULL, NULL, gfx::Transform());
 
     timer_.Reset();
     TreePriority priorities[] = {SAME_PRIORITY_FOR_BOTH_TREES,
@@ -216,7 +226,7 @@
         PictureLayerTiling::Create(1, bounds, &picture_layer_tiling_client_);
     picture_layer_tiling_client_.set_tree(ACTIVE_TREE);
     picture_layer_tiling_->UpdateTilePriorities(
-        ACTIVE_TREE, viewport, 1.0f, 1.0, Occlusion());
+        ACTIVE_TREE, viewport, 1.0f, 1.0, NULL, NULL, gfx::Transform());
 
     TreePriority priorities[] = {SAME_PRIORITY_FOR_BOTH_TREES,
                                  SMOOTHNESS_TAKES_PRIORITY,