Revert of Remove font cache code

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 <stddef.h>
 
@@ skipping 38 matching lines @@
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/installer_util_strings.h"
 #include "chrome/installer/util/l10n_string_util.h"
 #include "chrome/installer/util/shell_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/utility_process_host.h"
 #include "content/public/browser/utility_process_host_client.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/common/dwrite_font_platform_win.h"
 #include "content/public/common/main_function_params.h"
 #include "ui/base/cursor/cursor_loader_win.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_win.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/base/win/message_box_win.h"
 #include "ui/gfx/platform_font_win.h"
 #include "ui/gfx/switches.h"
+#include "ui/gfx/win/direct_write.h"
 #include "ui/strings/grit/app_locale_settings.h"
 
 #if defined(GOOGLE_CHROME_BUILD)
 #include "chrome/browser/google/did_run_updater_win.h"
 #endif
 
 #if BUILDFLAG(ENABLE_KASKO)
 #include "syzygy/kasko/api/reporter.h"
 #endif
 
@@ skipping 24 matching lines @@
   base::StringToInt(l10n_util::GetStringUTF16(IDS_MINIMUM_UI_FONT_SIZE),
                     &min_font_size);
   return min_font_size;
 }
 
 class TranslationDelegate : public installer::TranslationDelegate {
  public:
   base::string16 GetLocalizedString(int installer_string_id) override;
 };
 
+void ExecuteFontCacheBuildTask(const base::FilePath& path) {
+  base::WeakPtr<content::UtilityProcessHost> utility_process_host(
+      content::UtilityProcessHost::Create(NULL, NULL)->AsWeakPtr());
+  utility_process_host->SetName(
+      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_FONT_CACHE_BUILDER_NAME));
+  utility_process_host->DisableSandbox();
+  utility_process_host->Send(
+      new ChromeUtilityHostMsg_BuildDirectWriteFontCache(path));
+}
+
 #if BUILDFLAG(ENABLE_KASKO)
 void ObserveFailedCrashReportDirectory(const base::FilePath& path, bool error) {
   DCHECK(!error);
   if (error)
     return;
   base::FileEnumerator enumerator(path, true, base::FileEnumerator::FILES);
   for (base::FilePath report_file = enumerator.Next(); !report_file.empty();
        report_file = enumerator.Next()) {
     if (report_file.Extension() ==
         kasko::api::kPermanentFailureMinidumpExtension) {
@@ skipping 184 matching lines @@
 
 void ChromeBrowserMainPartsWin::ShowMissingLocaleMessageBox() {
   ui::MessageBox(NULL,
                  base::ASCIIToUTF16(chrome_browser::kMissingLocaleDataMessage),
                  base::ASCIIToUTF16(chrome_browser::kMissingLocaleDataTitle),
                  MB_OK | MB_ICONERROR | MB_TOPMOST);
 }
 
 void ChromeBrowserMainPartsWin::PostProfileInit() {
   ChromeBrowserMainParts::PostProfileInit();
+
+  // DirectWrite support is mainly available Windows 7 and up.
+  // Skip loading the font cache if we are using the font proxy field trial.
+  if (gfx::win::ShouldUseDirectWrite() &&
+      !content::ShouldUseDirectWriteFontProxyFieldTrial()) {
+    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)) {
+      // 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 = 30;
+      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(nullptr));
 
   // Set up a task to verify installed modules in the current process.
   content::BrowserThread::PostAfterStartupTask(
       FROM_HERE, content::BrowserThread::GetBlockingPool(),
@@ skipping 186 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);
 }