Plugin Power Saver: Implement size-based heuristic for peripheral content.

content/browser/plugin_content_origin_whitelist.h

+// Copyright 2014 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_PLUGIN_CONTENT_ORIGIN_WHITELIST_H_
+#define CONTENT_BROWSER_PLUGIN_CONTENT_ORIGIN_WHITELIST_H_
+
+#include <set>
+
+#include "content/public/browser/web_contents_observer.h"
+#include "url/gurl.h"
+
+namespace content {
+
+class WebContents;
+
+// This class manages the tab-wide list of temporarily whitelisted plugin
+// content origins that are exempt from power saving.
+//
+// RenderFrames report content origins that should be whitelisted via IPC.
+// This class aggregates those origins and broadcasts the total list to all
+// RenderFrames owned by the tab (WebContents). This class also sends these
+// origins to any newly created RenderFrames.
+//
+// Tab-wide whitelists are cleared by top-level navigation. RenderFrames that
+// persist across top level navigations are responsible for clearing their own
+// whitelists.
+class PluginContentOriginWhitelist : public WebContentsObserver {
+ public:
+  explicit PluginContentOriginWhitelist(WebContents* web_contents);
+  ~PluginContentOriginWhitelist() override;
+
+ private:
+  // WebContentsObserver implementation.
+  void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
+  bool OnMessageReceived(const IPC::Message& message,
+                         RenderFrameHost* render_frame_host) override;
+  void DidNavigateMainFrame(
+      const LoadCommittedDetails& details,
+      const FrameNavigateParams& params) override;
+
+  void OnPluginContentOriginAllowed(const GURL& content_origin);
+
+  std::set<GURL> whitelist_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginContentOriginWhitelist);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PLUGIN_CONTENT_ORIGIN_WHITELIST_H_