Replace context parenting by sharing through mailboxes

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index 76acd155b3b6d0159c3b96dc5d948ef1ba9b8a67..c3820568d49dfce987743f298726515580bd2507 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -81,6 +81,7 @@ class GPU_EXPORT Texture {
   }
 
   void SetServiceId(GLuint service_id) {
+    DCHECK(service_id);
     service_id_ = service_id;
   }
 
@@ -124,10 +125,6 @@ class GPU_EXPORT Texture {
     return !!target();
   }
 
-  void SetNotOwned() {
-    owned_ = false;
-  }
-
   bool IsAttachedToFramebuffer() const {
     return framebuffer_attachment_count_ != 0;
   }
@@ -368,10 +365,6 @@ class GPU_EXPORT Texture {
   // The number of framebuffers this texture is attached to.
   int framebuffer_attachment_count_;
 
-  // Whether the associated context group owns this texture and should delete
-  // it.
-  bool owned_;
-
   // Whether this is a special streaming texture.
   bool stream_texture_;