Add GPU memory tab to the task manager.

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 "content/common/content_export.h"
 #include "content/public/common/gpu_feature_type.h"
 
@@ skipping 29 matching lines @@
   // process, establish GPU channel, and GPU info collection, should be
   // blocked.
   // Can be called on any thread.
   virtual bool GpuAccessAllowed() = 0;
 
   // Requests complete GPUinfo if it has not already been requested
   virtual void RequestCompleteGpuInfoIfNeeded() = 0;
 
   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() = 0;
+
   // Returns true if the software rendering should currently be used.
   virtual bool ShouldUseSoftwareRendering() = 0;
 
   // Register a path to the SwiftShader software renderer.
   virtual void RegisterSwiftShaderPath(const FilePath& path) = 0;
 
   virtual const base::ListValue& GetLogMessages() const = 0;
 
   // Registers/unregister |observer|.
   virtual void AddObserver(GpuDataManagerObserver* observer) = 0;
   virtual void RemoveObserver(GpuDataManagerObserver* observer) = 0;
 
  protected:
   virtual ~GpuDataManager() {}
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_GPU_DATA_MANAGER_H_