Limit renderer saved frames to avoid running out of fds.

content/browser/renderer_host/renderer_frame_manager.h

Index: content/browser/renderer_host/renderer_frame_manager.h
diff --git a/content/browser/renderer_host/renderer_frame_manager.h b/content/browser/renderer_host/renderer_frame_manager.h
index 8b72a65939cdbaf799c3f34e861cd881fe5aeb9b..f8d90f476f04ff77bcd40138c747263e74b65822 100644
--- a/content/browser/renderer_host/renderer_frame_manager.h
+++ b/content/browser/renderer_host/renderer_frame_manager.h
@@ -33,6 +33,9 @@ class CONTENT_EXPORT RendererFrameManager {
     return max_number_of_saved_frames_;
   }
 
+  // For testing only
+  void set_max_handles(float max_handles) { max_handles_ = max_handles; }
+
  private:
   RendererFrameManager();
   ~RendererFrameManager();
@@ -43,6 +46,7 @@ class CONTENT_EXPORT RendererFrameManager {
   std::map<RendererFrameManagerClient*, size_t> locked_frames_;
   std::list<RendererFrameManagerClient*> unlocked_frames_;
   size_t max_number_of_saved_frames_;
+  float max_handles_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererFrameManager);
 };