FrameGenerator should receive SurfaceInfo and use it in frame generation

cc/surfaces/surface_factory.cc

Index: cc/surfaces/surface_factory.cc
diff --git a/cc/surfaces/surface_factory.cc b/cc/surfaces/surface_factory.cc
index 8a859f66f277744c60564312909d08e7f588cf97..f5746325790bd4b390dfe9b936c37d1f5775de5f 100644
--- a/cc/surfaces/surface_factory.cc
+++ b/cc/surfaces/surface_factory.cc
@@ -67,7 +67,7 @@ void SurfaceFactory::SubmitCompositorFrame(const LocalFrameId& local_frame_id,
     gfx::Size frame_size;
     // CompositorFrames may not be populated with a RenderPass in unit tests.
     if (!frame.render_pass_list.empty())
-      frame_size = frame.render_pass_list[0]->output_rect.size();
+      frame_size = frame.render_pass_list.back()->output_rect.size();
     manager_->SurfaceCreated(SurfaceInfo(
         surface->surface_id(), frame.metadata.device_scale_factor, frame_size));
   }