Refactor GL bindings so there is no global GLApi or DriverGL.

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_egl_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_share_group.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gl_surface_egl.h"
 #include "ui/gl/gl_surface_osmesa.h"
 #include "ui/gl/gl_surface_stub.h"
 #include "ui/gl/init/ozone_util.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
 
 namespace gl {
 namespace init {
 
 namespace {
 
 bool HasDefaultImplementation(GLImplementation impl) {
-  return impl == kGLImplementationOSMesaGL || impl == kGLImplementationMockGL;
+  return impl == kGLImplementationOSMesaGL || impl == kGLImplementationMockGL ||
+         impl == kGLImplementationStubGL;
 }
 
 scoped_refptr<GLSurface> CreateDefaultViewGLSurface(
     gfx::AcceleratedWidget window) {
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL:
       return InitializeGLSurface(new GLSurfaceOSMesaHeadless());
     case kGLImplementationMockGL:
+    case kGLImplementationStubGL:
       return InitializeGLSurface(new GLSurfaceStub());
     default:
       NOTREACHED();
   }
   return nullptr;
 }
 
 scoped_refptr<GLSurface> CreateDefaultOffscreenGLSurface(
     const gfx::Size& size) {
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL:
       return InitializeGLSurface(
           new GLSurfaceOSMesa(
               GLSurfaceFormat(GLSurfaceFormat::PIXEL_LAYOUT_BGRA), size));
     case kGLImplementationMockGL:
+    case kGLImplementationStubGL:
       return InitializeGLSurface(new GLSurfaceStub);
     default:
       NOTREACHED();
   }
   return nullptr;
 }
 
 }  // namespace
 
 std::vector<GLImplementation> GetAllowedGLImplementations() {
@@ skipping 21 matching lines @@
   TRACE_EVENT0("gpu", "gl::init::CreateGLContext");
 
   if (HasGLOzone()) {
     return GetGLOzone()->CreateGLContext(share_group, compatible_surface,
                                          attribs);
   }
 
   switch (GetGLImplementation()) {
     case kGLImplementationMockGL:
       return scoped_refptr<GLContext>(new GLContextStub(share_group));
+    case kGLImplementationStubGL: {
+      scoped_refptr<GLContextStub> stub_context =
+          new GLContextStub(share_group);
+      stub_context->SetUseStubApi(true);
+      return stub_context;
+    }
     case kGLImplementationOSMesaGL:
       return InitializeGLContext(new GLContextOSMesa(share_group),
                                  compatible_surface, attribs);
     case kGLImplementationEGLGLES2:
       return InitializeGLContext(new GLContextEGL(share_group),
                                  compatible_surface, attribs);
     default:
       NOTREACHED();
   }
   return nullptr;
@@ skipping 43 matching lines @@
     return CreateDefaultOffscreenGLSurface(size);
 
   // TODO(kylechar): This is deprecated and can be removed once all Ozone
   // platforms use GLOzone instead.
   return GetSurfaceFactoryOzone()->CreateOffscreenGLSurface(
       GetGLImplementation(), size);
 }
 
 }  // namespace init
 }  // namespace gl