Move responsiblity of tab suspending from renderer to TabManager

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index 64518ca89523da9fb6fea35416fda47e49f60933..4b0d3c72ab0c9022a3d61b730741562d28970492 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -316,6 +316,8 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   virtual void IncrementWorkerRefCount() = 0;
   virtual void DecrementWorkerRefCount() = 0;
 
+  virtual void Suspend() = 0;
+
   // Returns the current number of active views in this process.  Excludes
   // any RenderViewHosts that are swapped out.
   size_t GetActiveViewCount();