cc: Only use single quad pass optimization when quad rect matches pass rect

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index 002f32c4ab21a854ea6fea6602830842d28940aa..71861fb361d8b7dac8789e2fa311af09b4f014d7 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -996,8 +996,10 @@ const TileDrawQuad* GLRenderer::CanPassBeDrawnDirectly(const RenderPass* pass) {
 
   const DrawQuad* quad = *pass->quad_list.BackToFrontBegin();
   // Hack: this could be supported by concatenating transforms, but
-  // in practice if there is one quad, it is at the origin of the render pass.
-  if (!quad->shared_quad_state->quad_to_target_transform.IsIdentity())
+  // in practice if there is one quad, it is at the origin of the render pass
+  // and has the same size as the pass.
+  if (!quad->shared_quad_state->quad_to_target_transform.IsIdentity() ||
+      quad->rect != pass->output_rect)
     return nullptr;
   // The quad is expected to be the entire layer so that AA edges are correct.
   if (gfx::Rect(quad->shared_quad_state->quad_layer_bounds) != quad->rect)