Make gpu black list work again on Linux

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>
 
@@ skipping 21 matching lines @@
  public:
   typedef base::Callback<void(const std::list<base::ProcessHandle>&)>
       GetGpuProcessHandlesCallback;
 
   // Getter for the singleton.
   CONTENT_EXPORT static GpuDataManager* GetInstance();
 
   virtual void InitializeForTesting(const std::string& gpu_blacklist_json,
                                     const gpu::GPUInfo& gpu_info) = 0;
 
+  virtual bool IsInitialized() const = 0;
+
   virtual bool IsFeatureBlacklisted(int feature) const = 0;
 
   virtual gpu::GPUInfo GetGPUInfo() const = 0;
 
   // Retrieves a list of process handles for all gpu processes.
   virtual void GetGpuProcessHandles(
       const GetGpuProcessHandlesCallback& callback) const = 0;
 
   // This indicator might change because we could collect more GPU info or
   // because the GPU blacklist could be updated.
@@ skipping 62 matching lines @@
   virtual void GetDisabledExtensions(
       std::string* disabled_extensions) const = 0;
 
  protected:
   virtual ~GpuDataManager() {}
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_GPU_DATA_MANAGER_H_