New implementation of font precache on Windows.

chrome/service/service_utility_process_host.cc

Index: chrome/service/service_utility_process_host.cc
diff --git a/chrome/service/service_utility_process_host.cc b/chrome/service/service_utility_process_host.cc
index 0c4e88c03a49d5935afb7bbc34827030c762ffde..9c77d0a8297b9100a5956a61fe7e01f2d747fa58 100644
--- a/chrome/service/service_utility_process_host.cc
+++ b/chrome/service/service_utility_process_host.cc
@@ -145,6 +145,8 @@ bool ServiceUtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP_EX(ServiceUtilityProcessHost, message, msg_is_ok)
 #if defined(OS_WIN)  // This hack is Windows-specific.
     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_PreCacheFont, OnPreCacheFont)
+    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ReleaseCachedFonts,
+                        OnReleaseCachedFonts)
 #endif
     IPC_MESSAGE_HANDLER(
         ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Succeeded,
@@ -166,7 +168,11 @@ bool ServiceUtilityProcessHost::MessageForClient(const IPC::Message& message) {
 
 #if defined(OS_WIN)  // This hack is Windows-specific.
 void ServiceUtilityProcessHost::OnPreCacheFont(const LOGFONT& font) {
-  PreCacheFont(font);
+  PreCacheFont(font, pid());
+}
+
+void ServiceUtilityProcessHost::OnReleaseCachedFonts() {
+  ReleaseCachedFonts(pid());

[jam, 2011/09/15 16:18:23]

you use pid for service processes, while for renderers you're using process_id
(which is not a pid, but rather a unique id). the reason we avoid using pids is
that they get recycled, which can cause some hard to catch bugs. Can you make
each ServiceutilityProcessHost generate a unique id using
ChildProcessInfo::GenerateChildProcessUniqueId, and pass that to the font
caching code

[arthurhsu, 2011/09/16 02:14:06]

Done.

 }
 #endif  // OS_WIN