Add/fix some comments for BlimpDelegatingOutputSurface

blimp/client/feature/compositor/blimp_delegating_output_surface.h

Index: blimp/client/feature/compositor/blimp_delegating_output_surface.h
diff --git a/blimp/client/feature/compositor/blimp_delegating_output_surface.h b/blimp/client/feature/compositor/blimp_delegating_output_surface.h
index 0a69ef02380b6159ae93f3d203e2f4005820409a..7a1cd69d713899d5cb15ef55021798310ebe406a 100644
--- a/blimp/client/feature/compositor/blimp_delegating_output_surface.h
+++ b/blimp/client/feature/compositor/blimp_delegating_output_surface.h
@@ -18,6 +18,7 @@
 namespace blimp {
 namespace client {
 
+// Delegating output surface that owns and forwards frames to a Display.
 class BlimpDelegatingOutputSurface : public cc::OutputSurface,
                                      public cc::SurfaceFactoryClient,
                                      public cc::DisplayClient {
@@ -51,8 +52,8 @@ class BlimpDelegatingOutputSurface : public cc::OutputSurface,
   void DisplayDidDrawAndSwap() override;
 
  private:
-  // TODO(danakj): These don't to be stored in unique_ptrs when OutputSurface
-  // is owned/destroyed on the compositor thread.
+  // TODO(danakj): These don't need to be stored in unique_ptrs when
+  // OutputSurface is owned/destroyed on the compositor thread.
   std::unique_ptr<cc::SurfaceManager> surface_manager_;
   std::unique_ptr<cc::SurfaceIdAllocator> surface_id_allocator_;
   cc::SurfaceId delegated_surface_id_;