exo::CompositorFrameSinkHolder's release callbacks hold ref

components/exo/buffer.h

Index: components/exo/buffer.h
diff --git a/components/exo/buffer.h b/components/exo/buffer.h
index e7b5b605c45e423e78ce5ce91cf92ee346110338..8e8737097e501e3be8b7bae5697a80c65879d959 100644
--- a/components/exo/buffer.h
+++ b/components/exo/buffer.h
@@ -29,6 +29,8 @@ class GpuMemoryBuffer;
 
 namespace exo {
 
+class CompositorFrameSinkHolder;
+
 // This class provides the content for a Surface. The mechanism by which a
 // client provides and updates the contents is the responsibility of the client
 // and not defined as part of this class.
@@ -56,7 +58,8 @@ class Buffer : public base::SupportsWeakPtr<Buffer> {
   std::unique_ptr<cc::SingleReleaseCallback> ProduceTextureMailbox(
       cc::TextureMailbox* mailbox,
       bool secure_output_only,
-      bool client_usage);
+      bool client_usage,
+      CompositorFrameSinkHolder* compositor_frame_sink_holder);
 
   // This should be called when the buffer is attached to a Surface.
   void OnAttach();
@@ -80,10 +83,24 @@ class Buffer : public base::SupportsWeakPtr<Buffer> {
   // Runs the release callback if the buffer isn't attached or in use.
   void CheckReleaseCallback();
 
+  // This is a wrapper function for ReleaseTexture. It holds onto a ref to
+  // CompositorFrameSinkHolder to keep it alive and calls
+  // ReleaseTexture(texture).
+  void ReleaseTextureAndCompositorFrameSinkHolder(
+      std::unique_ptr<Texture> texture,
+      CompositorFrameSinkHolder* compositor_frame_sink_holder);
+
   // This is used by ProduceTextureMailbox() to produce a release callback
   // that releases a texture so it can be destroyed or reused.
   void ReleaseTexture(std::unique_ptr<Texture> texture);
 
+  // This is a wrapper function for ReleaseContentsTexture. It holds onto a ref
+  // to CompositorFrameSinkHolder to keep it alive and calls
+  // ReleaseTexture(texture).
+  void ReleaseContentsTextureAndCompositorFrameSinkHolder(
+      std::unique_ptr<Texture> texture,
+      CompositorFrameSinkHolder* compositor_frame_sink_holder);
+
   // This is used by ProduceTextureMailbox() to produce a release callback
   // that releases the buffer contents referenced by a texture before the
   // texture is destroyed or reused.