Allow switching to SwiftShader when GPU is blacklisted

content/browser/gpu/gpu_process_host.h

 // Copyright (c) 2011 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_BROWSER_GPU_GPU_PROCESS_HOST_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_
 #pragma once
 
 #include <map>
 #include <queue>
@@ skipping 62 matching lines @@
 
   // Tells the GPU process to create a new command buffer that draws into the
   // window associated with the given renderer.
   void CreateViewCommandBuffer(
       gfx::PluginWindowHandle compositing_surface,
       int32 render_view_id,
       int32 renderer_id,
       const GPUCreateCommandBufferConfig& init_params,
       CreateCommandBufferCallback* callback);
 
+  // Whether this GPU process is set up to use software rendering.
+  bool software_rendering();
+
  private:
   GpuProcessHost(int host_id);
   virtual ~GpuProcessHost();
 
   bool Init();
 
   // Post an IPC message to the UI shim's message handler on the UI thread.
   void RouteOnUIThread(const IPC::Message& message);
 
   virtual bool CanShutdown();
@@ skipping 49 matching lines @@
   // Qeueud messages to send when the process launches.
   std::queue<IPC::Message*> queued_messages_;
 
   // The handle for the GPU process or null if it is not known to be launched.
   base::ProcessHandle gpu_process_;
 
   // Whether we are running a GPU thread inside the browser process instead
   // of a separate GPU process.
   bool in_process_;
 
+  bool software_rendering_;
+
   scoped_ptr<GpuMainThread> in_process_gpu_thread_;
 
   // Master switch for enabling/disabling GPU acceleration for the current
   // browser session. It does not change the acceleration settings for
   // existing tabs, just the future ones.
   CONTENT_EXPORT static bool gpu_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_