Free worker context resources on idle.

cc/test/test_context_support.h

Index: cc/test/test_context_support.h
diff --git a/cc/test/test_context_support.h b/cc/test/test_context_support.h
index 6d162001063e1f10392039f26e1ab93dd5346af4..045dcdb94693e16e2c9c09b79752a39147fdf315 100644
--- a/cc/test/test_context_support.h
+++ b/cc/test/test_context_support.h
@@ -47,6 +47,10 @@ class TestContextSupport : public gpu::ContextSupport {
       std::unique_ptr<ScopedVisibility> visibility) override;
   bool AnyClientsVisible() const override;
 
+  std::unique_ptr<ScopedBusy> ClientBecameBusy() override;
+  void ClientBecameNotBusy(std::unique_ptr<ScopedBusy> busy) override;
+  void SetIdleCallback(const base::Closure& callback) override;
+
   void CallAllSyncPointCallbacks();
 
   typedef base::Callback<void(int plane_z_order,