Move GLContext creation from //ui/gl to //ui/gl/init.

ui/gl/init/gl_factory_ozone.cc

+// Copyright 2016 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/gl/init/gl_factory.h"
+
+#include "base/logging.h"
+#include "base/trace_event/trace_event.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_context_egl.h"
+#include "ui/gl/gl_context_osmesa.h"
+#include "ui/gl/gl_context_stub.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/gl/gl_share_group.h"
+#include "ui/gl/gl_surface.h"
+
+namespace gl {
+namespace init {
+
+scoped_refptr<GLContext> CreateGLContext(GLShareGroup* share_group,
+                                         GLSurface* compatible_surface,
+                                         GpuPreference gpu_preference) {
+  TRACE_EVENT0("gpu", "gl::init::CreateGLContext");
+  switch (GetGLImplementation()) {
+    case kGLImplementationMockGL:
+      return scoped_refptr<GLContext>(new GLContextStub(share_group));
+    case kGLImplementationOSMesaGL:
+      return InitializeGLContext(new GLContextOSMesa(share_group),
+                                 compatible_surface, gpu_preference);
+    case kGLImplementationEGLGLES2:
+      return InitializeGLContext(new GLContextEGL(share_group),
+                                 compatible_surface, gpu_preference);
+
+    default:
+      NOTREACHED();
+      return nullptr;
+  }
+}
+
+}  // namespace init
+}  // namespace gl