Add logic to switch to DirectWrite font proxy via field trial.

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 0a1238b0e86f8f3a59a6579e9170f9b281f2f8a5..895491dfed29d80f6ed8a35c7387d76fefd6c5c3 100644
--- a/chrome/browser/chrome_browser_main_win.cc
+++ b/chrome/browser/chrome_browser_main_win.cc
@@ -115,8 +115,8 @@ class TranslationDelegate : public installer::TranslationDelegate {
 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->SetName(
+      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_FONT_CACHE_BUILDER_NAME));
   utility_process_host->DisableSandbox();
   utility_process_host->Send(
       new ChromeUtilityHostMsg_BuildDirectWriteFontCache(path));
@@ -344,7 +344,9 @@ void ChromeBrowserMainPartsWin::PostProfileInit() {
   ChromeBrowserMainParts::PostProfileInit();
 
   // DirectWrite support is mainly available Windows 7 and up.
-  if (gfx::win::ShouldUseDirectWrite()) {
+  // 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
@@ -354,14 +356,14 @@ void ChromeBrowserMainPartsWin::PostProfileInit() {
       // 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.
+      // - 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.
+      // 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(