New implementation of font precache on Windows.

chrome/renderer/chrome_render_process_observer.cc

 // Copyright (c) 2011 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/renderer/chrome_render_process_observer.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 147 matching lines @@
                               DWORD length) {
   int rv = GetFontData(hdc, table, offset, buffer, length);
   if (rv == GDI_ERROR && hdc) {
     HFONT font = static_cast<HFONT>(GetCurrentObject(hdc, OBJ_FONT));
 
     LOGFONT logfont;
     if (GetObject(font, sizeof(LOGFONT), &logfont)) {
       std::vector<char> font_data;
       if (RenderThread::current()->Send(new ViewHostMsg_PreCacheFont(logfont)))
         rv = GetFontData(hdc, table, offset, buffer, length);
+        RenderThread::current()->Send(new ViewHostMsg_ReleaseCachedFonts);
     }
   }
   return rv;
 }
 #endif  // OS_WIN
 
 #if defined(OS_POSIX)
 class SuicideOnChannelErrorFilter : public IPC::ChannelProxy::MessageFilter {
   void OnChannelError() {
     // On POSIX, at least, one can install an unload handler which loops
@@ skipping 363 matching lines @@
   }
 
 #if !defined(OS_MACOSX) && defined(USE_TCMALLOC)
   // Tell tcmalloc to release any free pages it's still holding.
   MallocExtension::instance()->ReleaseFreeMemory();
 #endif
 
   if (client_)
     client_->OnPurgeMemory();
 }