Revert of Remove font cache code

chrome/browser/chrome_browser_main_win.cc

Index: chrome/browser/chrome_browser_main_win.cc
diff --git a/chrome/browser/chrome_browser_main_win.cc b/chrome/browser/chrome_browser_main_win.cc
index 3a996d66a8f5d9c7d8b9e074a54edd37fef51573..3273de1e959d9343ebfd3d826a16352fe57c90a6 100644
--- a/chrome/browser/chrome_browser_main_win.cc
+++ b/chrome/browser/chrome_browser_main_win.cc
@@ -56,6 +56,7 @@
 #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"
@@ -64,6 +65,7 @@
 #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)
@@ -107,6 +109,16 @@
  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) {
@@ -312,6 +324,37 @@
 
 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() {