Move suspend logic into OnMemoryStateChange()

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index f48b60aa94cde3db26ae9df48c191780308b676d..884714b19e0eb3ab8ba91a6381a0bcf67f53d594 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -490,6 +490,9 @@ class CONTENT_EXPORT RenderThreadImpl
   std::unique_ptr<base::SharedMemory> AllocateSharedMemory(
       size_t size) override;
 
+  // Purges memory and suspends the renderer.
+  void SuspendRenderer();
+
   // base::MemoryCoordinatorClient implementation:
   void OnMemoryStateChange(base::MemoryState state) override;