Revert of Refactor context creation parameters into a struct.

ui/gl/gl_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 UI_GL_GL_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 15 matching lines @@
 class GLContextVirtual;
 }  // namespace gpu
 
 namespace gl {
 
 class GLSurface;
 class GPUTiming;
 class GPUTimingClient;
 struct GLVersionInfo;
 
-struct GLContextAttribs {
-  GpuPreference gpu_preference = PreferIntegratedGpu;
-  bool bind_generates_resource = true;
-  bool webgl_compatibility_context = false;
-};
-
 // Encapsulates an OpenGL context, hiding platform specific management.
 class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
  public:
   explicit GLContext(GLShareGroup* share_group);
 
   // Initializes the GL context to be compatible with the given surface. The GL
   // context can be made with other surface's of the same type. The compatible
   // surface is only needed for certain platforms like WGL, OSMesa and GLX. It
   // should be specific for all platforms though.
-  virtual bool Initialize(GLSurface* compatible_surface,
-                          const GLContextAttribs& attribs) = 0;
+  virtual bool Initialize(
+      GLSurface* compatible_surface, GpuPreference gpu_preference) = 0;
 
   // Makes the GL context and a surface current on the current thread.
   virtual bool MakeCurrent(GLSurface* surface) = 0;
 
   // Releases this GL context and surface as current on the current thread.
   virtual void ReleaseCurrent(GLSurface* surface) = 0;
 
   // Returns true if this context and surface is current. Pass a null surface
   // if the current surface is not important.
   virtual bool IsCurrent(GLSurface* surface) = 0;
@@ skipping 135 matching lines @@
   std::unique_ptr<GPUTiming> gpu_timing_;
   DISALLOW_COPY_AND_ASSIGN(GLContextReal);
 };
 
 // Wraps GLContext in scoped_refptr and tries to initializes it. Returns a
 // scoped_refptr containing the initialized GLContext or nullptr if
 // initialization fails.
 GL_EXPORT scoped_refptr<GLContext> InitializeGLContext(
     scoped_refptr<GLContext> context,
     GLSurface* compatible_surface,
-    const GLContextAttribs& attribs);
+    GpuPreference gpu_preference);
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_CONTEXT_H_