Show a replacement plug-in for loading errors.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 10b5902d1210d118d8d692e464d00ab4db3b23e4..1f6f10805b78be593735285fcd60df09da5d2aec 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -14,6 +14,7 @@
 #include "content/public/common/content_client.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
 
+class FilePath;
 class GURL;
 class SkBitmap;
 
@@ -31,6 +32,7 @@ namespace webkit {
 namespace ppapi {
 class PpapiInterfaceFactoryManager;
 }
+struct WebPluginInfo;
 }
 
 namespace media {
@@ -83,6 +85,12 @@ class ContentRendererClient {
       const WebKit::WebPluginParams& params,
       WebKit::WebPlugin** plugin) = 0;
 
+  // Creates a replacement plug-in that is shown when the plug-in at |file_path|
+  // couldn't be loaded. This allows the embedder to show a custom placeholder.
+  virtual WebKit::WebPlugin* CreatePluginReplacement(
+      RenderView* render_view,
+      const FilePath& plugin_path) = 0;
+
   // Returns true if the embedder has an error page to show for the given http
   // status code. If so |error_domain| should be set to according to WebURLError
   // and the embedder's GetNavigationErrorHtml will be called afterwards to get