Replace context parenting by sharing through mailboxes

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index b64c67b9f0e4b63ae9408ecd12fa10947d85cd4b..b74a23ed6642329275248cced2823a799e116568 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -279,17 +279,6 @@ GLES2CmdHelper* GLES2Implementation::helper() const {
   return helper_;
 }
 
-GLuint GLES2Implementation::MakeTextureId() {
-  GLuint id;
-  GetIdHandler(id_namespaces::kTextures)->MakeIds(this, 0, 1, &id);
-  return id;
-}
-
-void GLES2Implementation::FreeTextureId(GLuint id) {
-  GetIdHandler(id_namespaces::kTextures)->FreeIds(
-      this, 1, &id, &GLES2Implementation::DeleteTexturesStub);
-}
-
 IdHandlerInterface* GLES2Implementation::GetIdHandler(int namespace_id) const {
   return share_group_->GetIdHandler(namespace_id);
 }