Do not clip inside OcclusionTracker.

cc/trees/layer_tree_host.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 
 #include "base/bind.h"
@@ skipping 960 matching lines @@
   // during the tree walk.
   typedef LayerIterator<Layer,
                         RenderSurfaceLayerList,
                         RenderSurface,
                         LayerIteratorActions::FrontToBack> LayerIteratorType;
 
   bool record_metrics_for_frame =
       settings_.show_overdraw_in_tracing &&
       base::debug::TraceLog::GetInstance() &&
       base::debug::TraceLog::GetInstance()->IsEnabled();
-  OcclusionTracker occlusion_tracker(
-      root_layer_->render_surface()->content_rect(), record_metrics_for_frame);
+  OcclusionTracker occlusion_tracker(record_metrics_for_frame);
   occlusion_tracker.set_minimum_tracking_size(
       settings_.minimum_occlusion_tracking_size);
 
   PrioritizeTextures(render_surface_layer_list,
                      occlusion_tracker.overdraw_metrics());
 
   in_paint_layer_contents_ = true;
 
   LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
   for (LayerIteratorType it =
@@ skipping 189 matching lines @@
     request.type = UIResourceRequest::UIResourceCreate;
     request.id = uid;
     bool resource_lost = true;
     request.bitmap = iter->second->GetBitmap(uid, resource_lost);
     DCHECK(request.bitmap.get());
     ui_resource_request_queue_.push_back(request);
   }
 }
 
 }  // namespace cc