Expose DiscardTab() to MemoryCoordiantor

content/browser/memory/memory_coordinator_impl.h

Index: content/browser/memory/memory_coordinator_impl.h
diff --git a/content/browser/memory/memory_coordinator_impl.h b/content/browser/memory/memory_coordinator_impl.h
index 250d58672b3410f2a97e77271df16dd431bde6e8..3fb76e95d0c3714a17b8838f23a2d424d634a7a1 100644
--- a/content/browser/memory/memory_coordinator_impl.h
+++ b/content/browser/memory/memory_coordinator_impl.h
@@ -99,6 +99,9 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public MemoryCoordinator,
   // the state is actually changed.
   bool ChangeStateIfNeeded(MemoryState prev_state, MemoryState next_state);
 
+  // Asks the delegate to discard a tab.
+  void DiscardTab();
+
  protected:
   // Returns the RenderProcessHost which is correspond to the given id.
   // Returns nullptr if there is no corresponding RenderProcessHost.
@@ -110,6 +113,8 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public MemoryCoordinator,
   void SetDelegateForTesting(
       std::unique_ptr<MemoryCoordinatorDelegate> delegate);
 
+  MemoryCoordinatorDelegate* delegate() { return delegate_.get(); }
+
   // Adds the given ChildMemoryCoordinator as a child of this coordinator.
   void AddChildForTesting(int dummy_render_process_id,
                           mojom::ChildMemoryCoordinatorPtr child);