cros: Preload external extension icons.

chrome/browser/extensions/crx_installer.h

 // Copyright (c) 2012 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_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 
+#include <map>
+#include <set>
 #include <string>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/crx_installer_error.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/sandboxed_unpacker.h"
 #include "chrome/browser/extensions/webstore_installer.h"
@@ skipping 144 matching lines @@
   }
 
   void set_page_ordinal(const syncer::StringOrdinal& page_ordinal) {
     page_ordinal_ = page_ordinal;
   }
 
   void set_error_on_unsupported_requirements(bool val) {
     error_on_unsupported_requirements_ = val;
   }
 
+  void set_preload_sizes(const std::set<int>& sizes) { preload_sizes_ = sizes; }
+
   bool did_handle_successfully() const { return did_handle_successfully_; }
 
   Profile* profile() { return profile_; }
 
  private:
   friend class ExtensionUpdaterTest;
   friend class ExtensionCrxInstallerTest;
 
   CrxInstaller(base::WeakPtr<ExtensionService> frontend_weak,
                ExtensionInstallPrompt* client,
@@ skipping 35 matching lines @@
   // notify the frontend.
   void CompleteInstall();
 
   // Result reporting.
   void ReportFailureFromFileThread(const CrxInstallerError& error);
   void ReportFailureFromUIThread(const CrxInstallerError& error);
   void ReportSuccessFromFileThread();
   void ReportSuccessFromUIThread();
   void NotifyCrxInstallComplete(const Extension* extension);
 
+  // Runs on File thread. Preload icons if necessary.
+  void PreloadIcons();
+
+  // Runs on UI thread. Update extension icon cache with pre-loaded icons.
+  void CachePreloadedIcons();
+
   // The file we're installing.
   FilePath source_file_;
 
   // The URL the file was downloaded from.
   GURL download_url_;
 
   // The directory extensions are installed to.
   FilePath install_directory_;
 
   // The location the installation came from (bundled with Chromium, registry,
@@ skipping 114 matching lines @@
 
   // Whether we should produce an error if the manifest declares requirements
   // that are not met. If false and there is an unmet requirement, the install
   // will continue but the extension will be distabled.
   bool error_on_unsupported_requirements_;
 
   scoped_ptr<RequirementsChecker> requirements_checker_;
 
   bool has_requirement_errors_;
 
+  // Sizes of the icons that need to be pre-loaded.
+  std::set<int> preload_sizes_;
+
+  // Maps requested preload icon size to loaded icons.
+  std::map<int, SkBitmap> preload_map_;
+
   DISALLOW_COPY_AND_ASSIGN(CrxInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_