message: Add event for base of GL multi draw commands
diff: @@ -2195,7 +2195,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawArrays(SerialiserType &ser, GLenum mode
  draw.topology = MakePrimitiveTopology(mode);
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  @@ -2357,7 +2358,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawElements(SerialiserType &ser, GLenum mo
  draw.topology = MakePrimitiveTopology(mode);
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  @@ -2526,7 +2528,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawElementsBaseVertex(SerialiserType &ser,
  draw.topology = MakePrimitiveTopology(mode);
  draw.indexByteWidth = IdxSize;
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  @@ -2680,7 +2683,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawArraysIndirect(SerialiserType &ser, GLe
  draw.topology = MakePrimitiveTopology(mode);
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  @@ -2903,7 +2907,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawElementsIndirect(SerialiserType &ser, G
  draw.topology = MakePrimitiveTopology(mode);
  draw.indexByteWidth = IdxSize;
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  @@ -3132,7 +3137,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawArraysIndirectCount(SerialiserType &ser
  draw.topology = MakePrimitiveTopology(mode);
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  @@ -3364,7 +3370,8 @@ bool WrappedOpenGL::Serialise_glMultiDrawElementsIndirectCount(SerialiserType &s
  draw.topology = MakePrimitiveTopology(mode);
  draw.indexByteWidth = IdxSize;
  - AddDrawcall(draw, false);
  + AddEvent();
  + AddDrawcall(draw, true);
  m_DrawcallStack.push_back(&m_DrawcallStack.back()->children.back());
  