Introduce new async IPC message to get file icons

chrome/renderer/render_view.h

Index: chrome/renderer/render_view.h
===================================================================
--- chrome/renderer/render_view.h	(revision 46794)
+++ chrome/renderer/render_view.h	(working copy)
@@ -15,6 +15,7 @@
 #include "app/surface/transport_dib.h"
 #include "base/basictypes.h"
 #include "base/file_path.h"
+#include "base/hash_tables.h"
 #include "base/id_map.h"
 #include "base/linked_ptr.h"
 #include "base/shared_memory.h"
@@ -220,6 +221,9 @@
   virtual WebKit::WebNotificationPresenter* notificationPresenter() {
     return notification_provider_.get();
   }
+  virtual bool chooseIconForFiles(
+      const WebKit::WebVector<WebKit::WebString>& filenames,
+      WebKit::WebIconLoadingCompletion* completion);
   virtual void didStartLoading();
   virtual void didStopLoading();
   virtual bool isSmartInsertDeleteEnabled();
@@ -717,6 +721,8 @@
   void OnDragSourceSystemDragEnded();
   void OnInstallMissingPlugin();
   void OnFileChooserResponse(const std::vector<FilePath>& paths);
+  void OnChooseIconForFilesResponse(
+      int request_id, const std::vector<unsigned char>& icon_data);
   void OnEnableViewSourceMode();
   void OnEnablePreferredSizeChangedMode();
   void OnDisableScrollbarsForSmallWindows(
@@ -1046,6 +1052,13 @@
   struct PendingFileChooser;
   std::deque< linked_ptr<PendingFileChooser> > file_chooser_completions_;
 
+  // How many times chooseIconForFiles() is called.
+  int choose_icon_for_files_counter_;
+
+  // icon_for_files_counter_ -> WebIconLoadingCompletion* map.
+  typedef base::hash_map<int, WebKit::WebIconLoadingCompletion*> IconLoadingMap;
+  IconLoadingMap icon_loading_map_;
+
   int history_list_offset_;
   int history_list_length_;