Delete the font cache file.

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..902960001f7df3a2dfaa9ef07b9f94fed52b0265 100644
--- a/chrome/browser/chrome_browser_main_win.cc
+++ b/chrome/browser/chrome_browser_main_win.cc
@@ -80,6 +80,8 @@ typedef HRESULT (STDAPICALLTYPE* RegisterApplicationRestartProc)(
     const wchar_t* command_line,
     DWORD flags);
 
+const char kFontCacheSharedSectionName[] = "ChromeDWriteFontCache";
+
 void InitializeWindowProcExceptions() {
   // Get the breakpad pointer from chrome.exe
   base::win::WinProcExceptionFilter exception_filter =
@@ -202,6 +204,12 @@ void DetectFaultTolerantHeap() {
   UMA_HISTOGRAM_ENUMERATION("FaultTolerantHeap", detected, FTH_FLAGS_COUNT);
 }
 
+void DeleteDirectWriteFontCache(base::FilePath path) {
+  // TODO(kulshin): delete this function and associated code in 2017.
+  // Attempt to delete the font cache and ignore any errors.
+  base::DeleteFile(path, false /*recursive*/);

[gab, 2016/04/14 15:04:29]

Define

static const char kFontCacheSharedSectionName[] = "ChromeDWriteFontCache";

locally in this method instead.

[gab, 2016/04/14 15:04:29]

Use kFontCacheSharedSectionName directly here instead of binding the path
(otherwise you might as well just Bind DeleteFile(kFontCacheSharedSectionName,
false) -- I do prefer having the custom method but without |path| param since
it's always constant)

[Ilya Kulshin, 2016/04/14 21:55:37]

Unfortunately I still need the path, since I need the profile directory. I can't
really make this a member since this code runs on a different thread, so I
switched to binding DeleteFile directly. I have no objections to switching back
to a helper function with a |path| parameter if you prefer that instead.

[Ilya Kulshin, 2016/04/14 21:55:37]

Inlined the string constant altogether, since it was used in only one place.

+}
+
 }  // namespace
 
 void ShowCloseBrowserFirstMessageBox() {
@@ -312,6 +320,14 @@ void ChromeBrowserMainPartsWin::ShowMissingLocaleMessageBox() {
 
 void ChromeBrowserMainPartsWin::PostProfileInit() {
   ChromeBrowserMainParts::PostProfileInit();
+
+  base::FilePath path(
+      profile()->GetPath().AppendASCII(kFontCacheSharedSectionName));
+  const int kBuildFontCacheDelaySec = 30;
+  content::BrowserThread::PostDelayedTask(

[gab, 2016/04/14 15:04:29]

Use BrowserThread::PostAfterStartupTask() instead of an arbitrary delay.

[Ilya Kulshin, 2016/04/14 21:55:37]

Done.

+      content::BrowserThread::FILE, FROM_HERE,
+      base::Bind(DeleteDirectWriteFontCache, path),
+      base::TimeDelta::FromSeconds(kBuildFontCacheDelaySec));
 }
 
 void ChromeBrowserMainPartsWin::PostBrowserStart() {