Prevent hang monitor restarts when hidden

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 106 matching lines @@
   // Returns all RenderWidgetHosts including swapped out ones for
   // internal use. The public interface
   // RendgerWidgetHost::GetRenderWidgetHosts only returns active ones.
   static scoped_ptr<RenderWidgetHostIterator> GetAllRenderWidgetHosts();
 
   // Use RenderWidgetHostImpl::From(rwh) to downcast a
   // RenderWidgetHost to a RenderWidgetHostImpl.  Internally, this
   // uses RenderWidgetHost::AsRenderWidgetHostImpl().
   static RenderWidgetHostImpl* From(RenderWidgetHost* rwh);
 
-  void set_hung_renderer_delay_ms(const base::TimeDelta& timeout) {
-    hung_renderer_delay_ms_ = timeout.InMilliseconds();
+  void set_hung_renderer_delay(const base::TimeDelta& delay) {
+    hung_renderer_delay_ = delay;
   }
 
   // RenderWidgetHost implementation.
   void UpdateTextDirection(blink::WebTextDirection direction) override;
   void NotifyTextDirection() override;
   void Focus() override;
   void Blur() override;
   void SetActive(bool active) override;
   void CopyFromBackingStore(const gfx::Rect& src_rect,
                             const gfx::Size& accelerated_dst_size,
@@ skipping 446 matching lines @@
   // TODO(ccameron): Fix this.
   // http://crbug.com/404828
   base::WeakPtr<RenderWidgetHostViewBase> view_weak_;
 
   // true if a renderer has once been valid. We use this flag to display a sad
   // tab only when we lose our renderer and not if a paint occurs during
   // initialization.
   bool renderer_initialized_;
 
   // This value indicates how long to wait before we consider a renderer hung.
-  int64 hung_renderer_delay_ms_;
+  base::TimeDelta hung_renderer_delay_;
 
  private:
   friend class MockRenderWidgetHost;
 
   // Tell this object to destroy itself.
   void Destroy();
 
   // Called by |hang_monitor_timeout_| on delayed response from the renderer.
   void RendererIsUnresponsive();
 
@@ skipping 249 matching lines @@
   bool is_focused_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_