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

ui/gl/init/gl_factory_android.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_bindings.h"
 #include "ui/gl/gl_context.h"
@@ skipping 42 matching lines @@
 GLNonOwnedContext::GLNonOwnedContext(GLShareGroup* share_group)
     : GLContextReal(share_group), display_(nullptr) {}
 
 bool GLNonOwnedContext::Initialize(GLSurface* compatible_surface,
                                    const GLContextAttribs& attribs) {
   display_ = eglGetDisplay(EGL_DEFAULT_DISPLAY);
   return true;
 }
 
 bool GLNonOwnedContext::MakeCurrent(GLSurface* surface) {
-  SetRealGLApi();
+  BindGLApi();
   SetCurrent(surface);
   InitializeDynamicBindings();
   return true;
 }
 
 std::string GLNonOwnedContext::GetExtensions() {
   const char* extensions = eglQueryString(display_, EGL_EXTENSIONS);
   if (!extensions)
     return GLContext::GetExtensions();
 
@@ skipping 18 matching lines @@
   }
 }
 
 scoped_refptr<GLContext> CreateGLContext(GLShareGroup* share_group,
                                          GLSurface* compatible_surface,
                                          const GLContextAttribs& attribs) {
   TRACE_EVENT0("gpu", "gl::init::CreateGLContext");
   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);
     default:
       if (compatible_surface->GetHandle()) {
         return InitializeGLContext(new GLContextEGL(share_group),
                                    compatible_surface, attribs);
       } else {
         return InitializeGLContext(new GLNonOwnedContext(share_group),
                                    compatible_surface, attribs);
@@ skipping 33 matching lines @@
       if (GLSurfaceEGL::IsEGLSurfacelessContextSupported() &&
           (size.width() == 0 && size.height() == 0)) {
         return InitializeGLSurfaceWithFormat(
             new SurfacelessEGL(size), format);
       } else {
         return InitializeGLSurfaceWithFormat(
             new PbufferGLSurfaceEGL(size), format);
       }
     }
     case kGLImplementationMockGL:
+    case kGLImplementationStubGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace init
 }  // namespace gl