GLInProcessContext: support async flushes and dedicated GPU thread

gpu/command_buffer/client/gl_in_process_context.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 GPU_COMMAND_BUFFER_CLIENT_GL_IN_PROCESS_CONTEXT_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GL_IN_PROCESS_CONTEXT_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "gles2_impl_export.h"
@@ skipping 12 matching lines @@
 
 class GpuMemoryBufferFactory;
 
 class GLES2_IMPL_EXPORT GLInProcessContext {
  public:
   virtual ~GLInProcessContext() {}
 
   // Must be called before any GLInProcessContext instances are created.
   static void SetGpuMemoryBufferFactory(GpuMemoryBufferFactory* factory);
 
-  // Must be called before any GLInProcessContext instances are created.
-  // Default value is false.
-  static void EnableVirtualizedContext();
-
   // GLInProcessContext configuration attributes. These are the same as used by
   // EGL. Attributes are matched using a closest fit algorithm.
   enum Attribute {
     ALPHA_SIZE     = 0x3021,
     BLUE_SIZE      = 0x3022,
     GREEN_SIZE     = 0x3023,
     RED_SIZE       = 0x3024,
     DEPTH_SIZE     = 0x3025,
     STENCIL_SIZE   = 0x3026,
     SAMPLES        = 0x3031,
@@ skipping 20 matching lines @@
   virtual void SignalQuery(unsigned query, const base::Closure& callback) = 0;
 
   // Allows direct access to the GLES2 implementation so a GLInProcessContext
   // can be used without making it current.
   virtual gles2::GLES2Implementation* GetImplementation() = 0;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GL_IN_PROCESS_CONTEXT_H_