Add fixed raster scale use counter histograms.

third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.h

 // Copyright 2013 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.
 
 #ifndef WebLayerTreeViewImplForTesting_h
 #define WebLayerTreeViewImplForTesting_h
 
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
@@ skipping 70 matching lines @@
         float pageScale,
         float topControlsDelta) override;
     void RequestNewOutputSurface() override;
     void DidInitializeOutputSurface() override {}
     void DidFailToInitializeOutputSurface() override;
     void WillCommit() override {}
     void DidCommit() override {}
     void DidCommitAndDrawFrame() override {}
     void DidCompleteSwapBuffers() override {}
     void DidCompletePageScaleAnimation() override {}
+    void ReportFixedRasterScaleUseCounters(
+        bool hasBlurryContent,
+        bool hasPotentialPerformanceRegression) override {}
 
     // cc::LayerTreeHostSingleThreadClient implementation.
     void DidPostSwapBuffers() override {}
     void DidAbortSwapBuffers() override {}
 
 private:
     cc::TestTaskGraphRunner m_taskGraphRunner;
     std::unique_ptr<cc::LayerTreeHost> m_layerTreeHost;
 };
 
 } // namespace blink
 
 #endif // WebLayerTreeViewImplForTesting_h