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

ui/gl/init/gl_factory_win.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"
@@ skipping 43 matching lines @@
       return InitializeGLContext(new GLContextOSMesa(share_group),
                                  compatible_surface, attribs);
     case kGLImplementationEGLGLES2:
       return InitializeGLContext(new GLContextEGL(share_group),
                                  compatible_surface, attribs);
     case kGLImplementationDesktopGL:
       return InitializeGLContext(new GLContextWGL(share_group),
                                  compatible_surface, attribs);
     case kGLImplementationMockGL:
       return new GLContextStub(share_group);
+    case kGLImplementationStubGL: {
+      scoped_refptr<GLContextStub> stub_context =
+          new GLContextStub(share_group);
+      stub_context->SetUseStubApi(true);
+      return stub_context;
+    }
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 scoped_refptr<GLSurface> CreateViewGLSurface(gfx::AcceleratedWidget window) {
   TRACE_EVENT0("gpu", "gl::init::CreateViewGLSurface");
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL:
       return InitializeGLSurface(new GLSurfaceOSMesaWin(window));
     case kGLImplementationEGLGLES2: {
       DCHECK(window != gfx::kNullAcceleratedWidget);
       scoped_refptr<NativeViewGLSurfaceEGL> surface(
           new NativeViewGLSurfaceEGL(window));
       std::unique_ptr<gfx::VSyncProvider> sync_provider;
       sync_provider.reset(new VSyncProviderWin(window));
       if (!surface->Initialize(std::move(sync_provider)))
         return nullptr;
 
       return surface;
     }
     case kGLImplementationDesktopGL:
       return InitializeGLSurface(new NativeViewGLSurfaceWGL(window));
     case kGLImplementationMockGL:
+    case kGLImplementationStubGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 scoped_refptr<GLSurface> CreateOffscreenGLSurfaceWithFormat(
     const gfx::Size& size, GLSurfaceFormat format) {
   TRACE_EVENT0("gpu", "gl::init::CreateOffscreenGLSurface");
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL:
       format.SetDefaultPixelLayout(GLSurfaceFormat::PIXEL_LAYOUT_RGBA);
       return InitializeGLSurfaceWithFormat(
           new GLSurfaceOSMesa(format, size), format);
     case kGLImplementationEGLGLES2:
       return InitializeGLSurfaceWithFormat(
           new PbufferGLSurfaceEGL(size), format);
     case kGLImplementationDesktopGL:
       return InitializeGLSurfaceWithFormat(
           new PbufferGLSurfaceWGL(size), format);
     case kGLImplementationMockGL:
+    case kGLImplementationStubGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace init
 }  // namespace gl