Initialize blink only when needed in utility processes.

content/utility/utility_thread_impl.h

 // 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.
 
 #ifndef CONTENT_UTILITY_UTILITY_THREAD_IMPL_H_
 #define CONTENT_UTILITY_UTILITY_THREAD_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 25 matching lines @@
 class UtilityThreadImpl : public UtilityThread,
                           public ChildThreadImpl {
  public:
   UtilityThreadImpl();
   // Constructor that's used when running in single process mode.
   explicit UtilityThreadImpl(const InProcessChildThreadParams& params);
   ~UtilityThreadImpl() override;
   void Shutdown() override;
 
   void ReleaseProcessIfNeeded() override;
+  void EnsureBlinkInitialized() override;
 
  private:
   void Init();
 
   // ChildThread implementation.
   bool OnControlMessageReceived(const IPC::Message& msg) override;
 
   // IPC message handlers.
   void OnBatchModeStarted();
   void OnBatchModeFinished();
@@ skipping 19 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(UtilityThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_UTILITY_UTILITY_THREAD_IMPL_H_