Plugin Power Saver: Implement srcset syntax for posters.

chrome/renderer/plugins/chrome_plugin_placeholder.h

 // Copyright 2013 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 CHROME_RENDERER_PLUGINS_CHROME_PLUGIN_PLACEHOLDER_H_
 #define CHROME_RENDERER_PLUGINS_CHROME_PLUGIN_PLACEHOLDER_H_
 
 #include "components/plugins/renderer/loadable_plugin_placeholder.h"
 #include "content/public/renderer/context_menu_client.h"
 #include "content/public/renderer/render_process_observer.h"
 
 struct ChromeViewHostMsg_GetPluginInfo_Status;
 
 class ChromePluginPlaceholder : public plugins::LoadablePluginPlaceholder,
                                 public content::RenderProcessObserver,
                                 public content::ContextMenuClient {
  public:
   static const char kPluginPlaceholderDataURL[];
 
+  // If |poster_attribute| contains relative paths, |base_url| must be
+  // non-empty. This is so the placeholder can resolve the relative paths.
   static ChromePluginPlaceholder* CreateBlockedPlugin(
       content::RenderFrame* render_frame,
       blink::WebLocalFrame* frame,
       const blink::WebPluginParams& params,
       const content::WebPluginInfo& info,
       const std::string& identifier,
       const base::string16& name,
       int resource_id,
       const base::string16& message,
-      const GURL& poster_url);
+      const std::string& poster_attribute,
+      const GURL& base_url);
 
   // Creates a new WebViewPlugin with a MissingPlugin as a delegate.
   static ChromePluginPlaceholder* CreateMissingPlugin(
       content::RenderFrame* render_frame,
       blink::WebLocalFrame* frame,
       const blink::WebPluginParams& params);
 
   static ChromePluginPlaceholder* CreateErrorPlugin(
       content::RenderFrame* render_frame,
       const base::FilePath& plugin_path);
@@ skipping 57 matching lines @@
 #endif
 
   bool has_host_;
   int context_menu_request_id_;  // Nonzero when request pending.
   base::string16 plugin_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromePluginPlaceholder);
 };
 
 #endif  // CHROME_RENDERER_PLUGINS_CHROME_PLUGIN_PLACEHOLDER_H_