memory metrics: record growth after purging BG renderer's cache

content/renderer/render_thread_impl.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 544 matching lines @@
 
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
   void OnCreateNewSharedWorker(
       const WorkerProcessMsg_CreateWorker_Params& params);
   bool RendererIsHidden() const;
   void OnRendererHidden();
   void OnRendererVisible();
 
-  void RecordPurgeAndSuspendMetrics() const;
+  void RecordPurgeAndSuspendMetrics();
+  void RecordPurgeAndSuspendMemoryGrowthMetrics() const;
 
   void ReleaseFreeMemory();
 
   void OnSyncMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
   std::unique_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
       int routing_id);
 
   void OnRendererInterfaceRequest(mojom::RendererAssociatedRequest request);
@@ skipping 178 matching lines @@
   AssociatedInterfaceRegistryImpl associated_interfaces_;
 
   mojo::AssociatedBinding<mojom::Renderer> renderer_binding_;
 
   mojom::RenderFrameMessageFilterAssociatedPtr render_frame_message_filter_;
   mojom::RenderMessageFilterAssociatedPtr render_message_filter_;
   scoped_refptr<mojom::ThreadSafeRenderMessageFilterAssociatedPtr>
       thread_safe_render_message_filter_;
 
   base::CancelableClosure record_purge_suspend_metric_closure_;
+  RendererMemoryMetrics purge_and_suspend_memory_metrics_;
+  base::CancelableClosure record_purge_suspend_growth_metric_closure_;
 
   int32_t client_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_