gpu:: Remove GpuDataManagerObserver::OnVideoMemoryUsageStatsUpdate().

content/public/browser/gpu_data_manager.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_PUBLIC_BROWSER_GPU_DATA_MANAGER_H_
 #define CONTENT_PUBLIC_BROWSER_GPU_DATA_MANAGER_H_
 
 #include <list>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/process/process.h"
 #include "content/common/content_export.h"
 
 class GURL;
 
 namespace gpu {
 struct GPUInfo;
+struct VideoMemoryUsageStats;
 }
 
 namespace content {
 
 class GpuDataManagerObserver;
 
 // This class is fully thread-safe.
 class GpuDataManager {
  public:
   // Getter for the singleton.
@@ skipping 22 matching lines @@
   virtual void RequestCompleteGpuInfoIfNeeded() = 0;
 
   // Check if basic and context GPU info have been collected.
   virtual bool IsEssentialGpuInfoAvailable() const = 0;
 
   // On Windows, besides basic and context GPU info, it also checks if
   // DxDiagnostics have been collected.
   // On other platforms, it's the same as IsEsentialGpuInfoAvailable().
   virtual bool IsCompleteGpuInfoAvailable() const = 0;
 
-  // Requests that the GPU process report its current video memory usage stats,
-  // which can be retrieved via the GPU data manager's on-update function.
-  virtual void RequestVideoMemoryUsageStatsUpdate() const = 0;
+  // Requests that the GPU process report its current video memory usage stats.
+  virtual void RequestVideoMemoryUsageStatsUpdate(
+      const base::Callback<void(const gpu::VideoMemoryUsageStats& stats)>&
+          callback) const = 0;
 
   // Returns true if SwiftShader should be used.
   virtual bool ShouldUseSwiftShader() const = 0;
 
   // Registers/unregister |observer|.
   virtual void AddObserver(GpuDataManagerObserver* observer) = 0;
   virtual void RemoveObserver(GpuDataManagerObserver* observer) = 0;
 
   // Allows a given domain previously blocked from accessing 3D APIs
   // to access them again.
@@ skipping 27 matching lines @@
   // the backlists decision and applying commandline switches.
   virtual void SetGpuInfo(const gpu::GPUInfo& gpu_info) = 0;
 
  protected:
   virtual ~GpuDataManager() {}
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_GPU_DATA_MANAGER_H_