cc: Remove impl_transform_is_unknown argument from OcclusionTracker.

cc/trees/occlusion_tracker_perftest.cc

Index: cc/trees/occlusion_tracker_perftest.cc
diff --git a/cc/trees/occlusion_tracker_perftest.cc b/cc/trees/occlusion_tracker_perftest.cc
index 344e48cd1e76ffa562b7e01c2355d3d334af24a8..4961f29593f1b16eb6889bf9dca52c08149bd229 100644
--- a/cc/trees/occlusion_tracker_perftest.cc
+++ b/cc/trees/occlusion_tracker_perftest.cc
@@ -101,7 +101,6 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_FullyOccluded) {
 
   gfx::Transform transform_to_target;
   transform_to_target.Translate(0, 96);
-  bool impl_draw_transform_is_unknown = false;
 
   do {
     for (int x = 0; x < viewport_rect.width(); x += 256) {
@@ -110,8 +109,7 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_FullyOccluded) {
         gfx::Rect unoccluded =
             tracker.UnoccludedContentRect(pos.target_render_surface_layer,
                                           query_content_rect,
-                                          transform_to_target,
-                                          impl_draw_transform_is_unknown);
+                                          transform_to_target);
         // Sanity test that we're not hitting early outs.
         bool expect_empty =
             query_content_rect.right() <= viewport_rect.width() &&
@@ -180,7 +178,6 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_10OpaqueLayers) {
 
   gfx::Transform transform_to_target;
   transform_to_target.Translate(0, 96);
-  bool impl_draw_transform_is_unknown = false;
 
   do {
     for (int x = 0; x < viewport_rect.width(); x += 256) {
@@ -189,8 +186,7 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_10OpaqueLayers) {
         gfx::Rect unoccluded =
             tracker.UnoccludedContentRect(pos.target_render_surface_layer,
                                           query_content_rect,
-                                          transform_to_target,
-                                          impl_draw_transform_is_unknown);
+                                          transform_to_target);
       }
     }