Added directwrite warmup for PPAPI processes.

content/common/font_warmup_win.cc

Index: content/common/font_warmup_win.cc
diff --git a/content/common/font_warmup_win.cc b/content/common/font_warmup_win.cc
index d848db39000f8f72fae757e1f49307b62399d213..4cd583831ecf3010729206f882b8c505c9781b78 100644
--- a/content/common/font_warmup_win.cc
+++ b/content/common/font_warmup_win.cc
@@ -11,10 +11,13 @@
 #include "base/win/iat_patch_function.h"
 #include "base/win/windows_version.h"
 #include "content/public/common/dwrite_font_platform_win.h"
+#include "skia/ext/fontmgr_default_win.h"
+#include "skia/ext/refptr.h"
 #include "third_party/WebKit/public/web/win/WebFontRendering.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/ports/SkFontMgr.h"
 #include "third_party/skia/include/ports/SkTypeface_win.h"
+#include "ui/gfx/hud_font.h"
 
 namespace content {
 
@@ -206,4 +209,23 @@ SkFontMgr* GetPreSandboxWarmupFontMgr() {
   return g_warmup_fontmgr;
 }
 
+void WarmupDirectWrite() {
+  static bool warmup_initialized = false;
+  if (warmup_initialized)
+    return;
+  warmup_initialized = true;

[jam, 2015/09/21 21:26:26]

I don't see why these first four lines are needed? we know that it's only called
once.

+  // The objects used here are intentionally not freed as we want the Skia
+  // code to use these objects after warmup.
+  SetDefaultSkiaFactory(GetPreSandboxWarmupFontMgr());
+
+  // We need to warm up *some* font for DirectWrite. We also need to pass one
+  // down for the CC HUD code, so use the same one here. Note that we don't use
+  // a monospace as would be nice in an attempt to avoid a small startup time
+  // regression, see http://crbug.com/463613.
+  skia::RefPtr<SkTypeface> hud_typeface = skia::AdoptRef(
+      GetPreSandboxWarmupFontMgr()->legacyCreateTypeface("Times New Roman", 0));
+  DoPreSandboxWarmupForTypeface(hud_typeface.get());
+  gfx::SetHudTypeface(hud_typeface);
+}
+
 }  // namespace content