cc: Remove fixed raster scale, stop rasterizing with will-change.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index f558733c589de32d5ec3e280cf9f4788a7189439..c24e1d43ff788997178da04ea2e2c4cc98e3c454 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -243,8 +243,7 @@ LayerTreeHostImpl::LayerTreeHostImpl(
       id_(id),
       requires_high_res_to_draw_(false),
       is_likely_to_require_a_draw_(false),
-      mutator_(nullptr),
-      has_fixed_raster_scale_blurry_content_(false) {
+      mutator_(nullptr) {
   DCHECK(animation_host_);
   animation_host_->SetMutatorHostClient(this);
 
@@ -356,9 +355,6 @@ void LayerTreeHostImpl::CommitComplete() {
   UpdateTreeResourcesForGpuRasterizationIfNeeded();
   sync_tree()->set_needs_update_draw_properties();
 
-  // Advance the attempted scale change history before updating draw properties.
-  fixed_raster_scale_attempted_scale_change_history_ <<= 1;
-
   // We need an update immediately post-commit to have the opportunity to create
   // tilings.  Because invalidations may be coming from the main thread, it's
   // safe to do an update for lcd text at this point and see if lcd text needs
@@ -4030,14 +4026,4 @@ bool LayerTreeHostImpl::CommitToActiveTree() const {
   return !task_runner_provider_->HasImplThread();
 }
 
-bool LayerTreeHostImpl::HasFixedRasterScalePotentialPerformanceRegression()
-    const {
-  return fixed_raster_scale_attempted_scale_change_history_.count() >=
-         kFixedRasterScaleAttemptedScaleChangeThreshold;
-}
-
-void LayerTreeHostImpl::SetFixedRasterScaleAttemptedToChangeScale() {
-  fixed_raster_scale_attempted_scale_change_history_.set(0);
-}
-
 }  // namespace cc