[WebGL 2] primitive restart should be always enabled

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 5a0bfcb6f9ff5b278fd104149c67f368b88ac648..36ea276d22e58a87426bc757cb907a0a8d888a7c 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -6157,12 +6157,18 @@ void GLES2DecoderImpl::DoDisable(GLenum cap) {
   if (SetCapabilityState(cap, false)) {
     glDisable(cap);
   }
+  if (cap == GL_PRIMITIVE_RESTART_FIXED_INDEX) {
+    buffer_manager()->SetPrimitiveRestartState(false);
+  }
 }
 
 void GLES2DecoderImpl::DoEnable(GLenum cap) {
   if (SetCapabilityState(cap, true)) {
     glEnable(cap);
   }
+  if (cap == GL_PRIMITIVE_RESTART_FIXED_INDEX) {
+    buffer_manager()->SetPrimitiveRestartState(true);
+  }
 }
 
 void GLES2DecoderImpl::DoDepthRangef(GLclampf znear, GLclampf zfar) {