Add fixed raster scale use counter histograms.

cc/trees/single_thread_proxy.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/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 200 matching lines @@
   DCHECK(task_runner_provider_->IsMainThread());
 
   // TODO(robliao): Remove ScopedTracker below once https://crbug.com/461509 is
   // fixed.
   tracked_objects::ScopedTracker tracking_profile1(
       FROM_HERE_WITH_EXPLICIT_FUNCTION("461509 SingleThreadProxy::DoCommit1"));
   layer_tree_host_->WillCommit();
   devtools_instrumentation::ScopedCommitTrace commit_task(
       layer_tree_host_->id());
 
+  layer_tree_host_->ReportFixedRasterScaleUseCounters(
+      layer_tree_host_impl_->has_fixed_raster_scale_blurry_content(),
+      layer_tree_host_impl_
+          ->HasFixedRasterScalePotentialPerformanceRegression());
+
   // Commit immediately.
   {
     // TODO(robliao): Remove ScopedTracker below once https://crbug.com/461509
     // is fixed.
     tracked_objects::ScopedTracker tracking_profile2(
         FROM_HERE_WITH_EXPLICIT_FUNCTION(
             "461509 SingleThreadProxy::DoCommit2"));
     DebugScopedSetMainThreadBlocked main_thread_blocked(task_runner_provider_);
     DebugScopedSetImplThread impl(task_runner_provider_);
 
@@ skipping 651 matching lines @@
 void SingleThreadProxy::DidFinishImplFrame() {
   layer_tree_host_impl_->DidFinishImplFrame();
 #if DCHECK_IS_ON()
   DCHECK(inside_impl_frame_)
       << "DidFinishImplFrame called while not inside an impl frame!";
   inside_impl_frame_ = false;
 #endif
 }
 
 }  // namespace cc