cc: Implement shared worker contexts. (v1)

ui/compositor/test/in_process_context_provider.cc

Index: ui/compositor/test/in_process_context_provider.cc
diff --git a/ui/compositor/test/in_process_context_provider.cc b/ui/compositor/test/in_process_context_provider.cc
index 76cd19dc191ff8624982205a2d93b573b0058ecb..91a6de6d562acb9ce799935aeb1d83394030ccd9 100644
--- a/ui/compositor/test/in_process_context_provider.cc
+++ b/ui/compositor/test/in_process_context_provider.cc
@@ -86,8 +86,6 @@ InProcessContextProvider::InProcessContextProvider(
 }
 
 InProcessContextProvider::~InProcessContextProvider() {
-  DCHECK(main_thread_checker_.CalledOnValidThread() ||
-         context_thread_checker_.CalledOnValidThread());
 }
 
 bool InProcessContextProvider::BindToCurrentThread() {
@@ -231,4 +229,9 @@ void InProcessContextProvider::OnLostContext() {
     gr_context_->abandonContext();
 }
 
+bool InProcessContextProvider::HasBeenDestroyed() {
+  DCHECK(context_thread_checker_.CalledOnValidThread());
+  return destroyed_;
+}
+
 }  // namespace ui