Change for building font cache into separate thread inside utility process.

chrome/browser/chrome_browser_main_win.cc

 // 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.
 
 #include "chrome/browser/chrome_browser_main_win.h"
 
 #include <windows.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 231 matching lines @@
   ChromeBrowserMainParts::PostProfileInit();
 
   // DirectWrite support is mainly available Windows 7 and up.
   if (gfx::win::ShouldUseDirectWrite()) {
     base::FilePath path(
       profile()->GetPath().AppendASCII(content::kFontCacheSharedSectionName));
     // This function will create a read only section if cache file exists
     // otherwise it will spawn utility process to build cache file, which will
     // be used during next browser start/postprofileinit.
     if (!content::LoadFontCache(path)) {
-      content::BrowserThread::PostTask(
-          content::BrowserThread::IO, FROM_HERE,
-          base::Bind(ExecuteFontCacheBuildTask, path));
+      // We delay building of font cache until first startup page loads.
+      // During first renderer start there are lot of things happening
+      // simultaneously some of them are:
+      // - Renderer is going through all font files on the system to create
+      //   a font collection.
+      // - Renderer loading up startup URL, accessing HTML/JS File cache,
+      //   net activity etc.
+      // - Extension initialization.
+      // We delay building of cache mainly to avoid parallel font file
+      // loading along with Renderer. Some systems have significant number of
+      // font files which takes long time to process.
+      // Related information is at http://crbug.com/436195.
+      const int kBuildFontCacheDelaySec = 15;
+      content::BrowserThread::PostDelayedTask(
+          content::BrowserThread::IO,
+          FROM_HERE,
+          base::Bind(ExecuteFontCacheBuildTask, path),
+          base::TimeDelta::FromSeconds(kBuildFontCacheDelaySec));
     }
   }
 }
 
 void ChromeBrowserMainPartsWin::PostBrowserStart() {
   ChromeBrowserMainParts::PostBrowserStart();
 
   UMA_HISTOGRAM_BOOLEAN("Windows.Tablet", base::win::IsTabletDevice());
 
   // Set up a task to verify installed modules in the current process. Use a
@@ skipping 194 matching lines @@
   if (resource_id)
     return l10n_util::GetStringUTF16(resource_id);
   return base::string16();
 }
 
 // static
 void ChromeBrowserMainPartsWin::SetupInstallerUtilStrings() {
   CR_DEFINE_STATIC_LOCAL(TranslationDelegate, delegate, ());
   installer::SetTranslationDelegate(&delegate);
 }