Allow each WGC3D subclass to determine the correct GrGLInterface for its GrContext.

webkit/gpu/webgraphicscontext3d_in_process_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_impl.cc
===================================================================
--- webkit/gpu/webgraphicscontext3d_in_process_impl.cc	(revision 98420)
+++ webkit/gpu/webgraphicscontext3d_in_process_impl.cc	(working copy)
@@ -107,7 +107,6 @@
     bool render_directly_to_web_view) {
   if (!gfx::GLSurface::InitializeOneOff())
     return false;
-  gfx::BindSkiaToInProcessGL();
 
   render_directly_to_web_view_ = render_directly_to_web_view;
   gfx::GLShareGroup* share_group = 0;
@@ -1552,6 +1551,12 @@
   return GL_NO_ERROR;
 }
 
+#if WEBKIT_USING_SKIA
+GrGLInterface* WebGraphicsContext3DInProcessImpl::grGLInterface() {
+  return gfx::GetInProcessSkiaGLBinding();
+}
+#endif
+
 bool WebGraphicsContext3DInProcessImpl::AngleCreateCompilers() {
   if (!ShInitialize())
     return false;