Use ChildThreadImpl::thread_safe_sender in font proxy if available

content/renderer/renderer_main_platform_delegate_win.cc

 // Copyright (c) 2012 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 "content/renderer/renderer_main_platform_delegate.h"
 
 #include <dwrite.h>
 
 #include <memory>
 
@@ skipping 12 matching lines @@
 #include "sandbox/win/src/sandbox.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/win/WebFontRendering.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 #include "third_party/skia/include/ports/SkTypeface_win.h"
 #include "ui/display/win/dpi.h"
 #include "ui/gfx/win/direct_write.h"
 
 namespace content {
 
+namespace {
+
+// Helper function to cast RenderThread to IPC::Sender so we can Bind()
+// it.
+IPC::Sender* GetRenderThreadSender() {
+  return RenderThread::Get();
+}
+
+}  // namespace
+
 RendererMainPlatformDelegate::RendererMainPlatformDelegate(
     const MainFunctionParams& parameters)
     : parameters_(parameters) {}
 
 RendererMainPlatformDelegate::~RendererMainPlatformDelegate() {
 }
 
 void RendererMainPlatformDelegate::PlatformInitialize() {
   const base::CommandLine& command_line = parameters_.command_line;
 
   // Be mindful of what resources you acquire here. They can be used by
   // malicious code if the renderer gets compromised.
   bool no_sandbox = command_line.HasSwitch(switches::kNoSandbox);
 
   if (!no_sandbox) {
     // ICU DateFormat class (used in base/time_format.cc) needs to get the
     // Olson timezone ID by accessing the registry keys under
     // HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones.
     // After TimeZone::createDefault is called once here, the timezone ID is
     // cached and there's no more need to access the registry. If the sandbox
     // is disabled, we don't have to make this dummy call.
     std::unique_ptr<icu::TimeZone> zone(icu::TimeZone::createDefault());
 
-    InitializeDWriteFontProxy();
+    InitializeDWriteFontProxy(base::Bind(&GetRenderThreadSender));
   }
   // TODO(robliao): This should use WebScreenInfo. See http://crbug.com/604555.
   blink::WebFontRendering::setDeviceScaleFactor(display::win::GetDPIScale());
 }
 
 void RendererMainPlatformDelegate::PlatformUninitialize() {
   UninitializeDWriteFontProxy();
 }
 
 bool RendererMainPlatformDelegate::EnableSandbox() {
   sandbox::TargetServices* target_services =
       parameters_.sandbox_info->target_services;
 
   if (target_services) {
     // Cause advapi32 to load before the sandbox is turned on.
     unsigned int dummy_rand;
     rand_s(&dummy_rand);
 
     target_services->LowerToken();
     return true;
   }
   return false;
 }
 
 }  // namespace content