GLInProcessContext: support async flushes and dedicated GPU thread

gpu/command_buffer/client/gl_in_process_context.h

Index: gpu/command_buffer/client/gl_in_process_context.h
diff --git a/gpu/command_buffer/client/gl_in_process_context.h b/gpu/command_buffer/client/gl_in_process_context.h
index 9e38b1c84bf2041bad89f4334f0e809b62dc97af..2d0754b227434091d085500a3f9a865f02287d42 100644
--- a/gpu/command_buffer/client/gl_in_process_context.h
+++ b/gpu/command_buffer/client/gl_in_process_context.h
@@ -30,10 +30,6 @@ class GLES2_IMPL_EXPORT 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 {