sync compositor: pass simple gfx types by const ref

See bug for reasoning

BUG=159273

Review URL: https://codereview.chromium.org/1417893006

Cr-Commit-Position: refs/heads/master@{#356653}
void BrowserViewRenderer::UpdateParentDrawConstraints() {
  PostInvalidateWithFallback();
  ParentCompositorDrawConstraints parent_draw_constraints =
      shared_renderer_state_.GetParentDrawConstraintsOnUI();
  client_->ParentDrawConstraintsUpdated(parent_draw_constraints);
}

void BrowserViewRenderer::UpdateParentDrawConstraints() {
  PostInvalidateWithFallback();
  ParentCompositorDrawConstraints parent_draw_constraints =
      shared_renderer_state_.GetParentDrawConstraintsOnUI();
  client_->ParentDrawConstraintsUpdated(parent_draw_constraints);
}
