cc: Remove impl_transform_is_unknown argument from OcclusionTracker.

cc/trees/occlusion_tracker.cc

 // Copyright 2012 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/occlusion_tracker.h"
 
 #include <algorithm>
 
 #include "cc/base/math_util.h"
 #include "cc/debug/overdraw_metrics.h"
@@ skipping 486 matching lines @@
     gfx::Rect screen_space_rect =
         gfx::ToEnclosedRect(screen_space_quad.BoundingBox());
     non_occluding_screen_space_rects_->push_back(screen_space_rect);
   }
 }
 
 template <typename LayerType>
 bool OcclusionTracker<LayerType>::Occluded(
     const LayerType* render_target,
     const gfx::Rect& content_rect,
-    const gfx::Transform& draw_transform,
-    bool impl_draw_transform_is_unknown) const {
+    const gfx::Transform& draw_transform) const {
   DCHECK(!stack_.empty());
   if (stack_.empty())
     return false;
   if (content_rect.IsEmpty())
     return true;
-  if (impl_draw_transform_is_unknown)
-    return false;
 
   // For tests with no render target.
   if (!render_target)
     return false;
 
   DCHECK_EQ(render_target->render_target(), render_target);
   DCHECK(render_target->render_surface());
   DCHECK_EQ(render_target, stack_.back().target);
 
   if (stack_.back().occlusion_from_inside_target.IsEmpty() &&
@@ skipping 19 matching lines @@
   gfx::RectF unoccluded_rect_in_target_surface =
       unoccluded_region_in_target_surface.bounds();
 
   return unoccluded_rect_in_target_surface.IsEmpty();
 }
 
 template <typename LayerType>
 gfx::Rect OcclusionTracker<LayerType>::UnoccludedContentRect(
     const LayerType* render_target,
     const gfx::Rect& content_rect,
-    const gfx::Transform& draw_transform,
-    bool impl_draw_transform_is_unknown) const {
+    const gfx::Transform& draw_transform) const {
   DCHECK(!stack_.empty());
   if (stack_.empty())
     return content_rect;
   if (content_rect.IsEmpty())
     return content_rect;
-  if (impl_draw_transform_is_unknown)
-    return content_rect;
 
   // For tests with no render target.
   if (!render_target)
     return content_rect;
 
   DCHECK_EQ(render_target->render_target(), render_target);
   DCHECK(render_target->render_surface());
   DCHECK_EQ(render_target, stack_.back().target);
 
   if (stack_.back().occlusion_from_inside_target.IsEmpty() &&
@@ skipping 92 matching lines @@
   unoccluded_rect.Intersect(content_rect);
 
   return unoccluded_rect;
 }
 
 // Instantiate (and export) templates here for the linker.
 template class OcclusionTracker<Layer>;
 template class OcclusionTracker<LayerImpl>;
 
 }  // namespace cc