ozone: Allow using swiftshader with --use-gl=swiftshader.

ui/ozone/platform/cast/gl_ozone_egl_cast.cc

 // Copyright 2017 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.
 
 #include "ui/ozone/platform/cast/gl_ozone_egl_cast.h"
 
 #include <EGL/egl.h>
 #include <dlfcn.h>
 
 #include <utility>
@@ skipping 185 matching lines @@
     display_type_ = 0;
     have_display_type_ = false;
   }
 }
 
 void GLOzoneEglCast::ChildDestroyed() {
   if (egl_platform_->MultipleSurfaceUnsupported())
     DestroyWindow();
 }
 
-bool GLOzoneEglCast::LoadGLES2Bindings() {
+bool GLOzoneEglCast::LoadGLES2Bindings(gl::GLImplementation implementation) {
   if (state_ != kInitialized) {
     InitializeHardware();
     if (state_ != kInitialized) {
       return false;
     }
   }
 
   void* lib_egl = egl_platform_->GetEglLibrary();
   void* lib_gles2 = egl_platform_->GetGles2Library();
   gl::GLGetProcAddressProc gl_proc = reinterpret_cast<gl::GLGetProcAddressProc>(
       egl_platform_->GetGLProcAddressProc());
   if (!lib_egl || !lib_gles2 || !gl_proc) {
     return false;
   }
 
   gl::SetGLGetProcAddressProc(gl_proc);
   gl::AddGLNativeLibrary(lib_egl);
   gl::AddGLNativeLibrary(lib_gles2);
   return true;
 }
 
 }  // namespace ui