extensions/browser/deferred_start_render_host.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef EXTENSIONS_BROWSER_DEFERRED_START_RENDER_HOST_H_
   6 #define EXTENSIONS_BROWSER_DEFERRED_START_RENDER_HOST_H_
   7
   8 namespace extensions {
   9 class DeferredStartRenderHostObserver;
  10
  11 // A browser component that tracks a renderer. It allows for its renderer
  12 // startup to be deferred, to throttle resource usage upon profile startup.
  13 // To be used with ExtensionHostQueue.
  14 //
  15 // Note that if BackgroundContents and ExtensionHost are unified
  16 // (crbug.com/77790), this interface will be no longer needed.
  17 class DeferredStartRenderHost {
  18  public:
  19   virtual ~DeferredStartRenderHost() {}
  20
  21   // DeferredStartRenderHost lifetime can be observed.
  22   virtual void AddDeferredStartRenderHostObserver(
  23       DeferredStartRenderHostObserver* observer) = 0;
  24   virtual void RemoveDeferredStartRenderHostObserver(
  25       DeferredStartRenderHostObserver* observer) = 0;
  26
  27   // DO NOT CALL THIS unless you're implementing an ExtensionHostQueue.
  28   // Called by the ExtensionHostQueue to create the RenderView.
  29   virtual void CreateRenderViewNow() = 0;
  30 };
  31
  32 }  // namespace extensions
  33
  34 #endif  // EXTENSIONS_BROWSER_DEFERRED_START_RENDER_HOST_H_