Initialize blink only when needed in utility processes.

content/public/utility/utility_thread.h

Index: content/public/utility/utility_thread.h
diff --git a/content/public/utility/utility_thread.h b/content/public/utility/utility_thread.h
index 42bf10cf5eade593bd002ab86de55be1bc90ae69..acafd1a3ab37a29ea8a3e185742e403549521d71 100644
--- a/content/public/utility/utility_thread.h
+++ b/content/public/utility/utility_thread.h
@@ -21,6 +21,9 @@ class CONTENT_EXPORT UtilityThread : virtual public ChildThread {
 
   // Releases the process if we are not (or no longer) in batch mode.
   virtual void ReleaseProcessIfNeeded() = 0;
+
+  // Initializes blink if it hasn't already been initialized.
+  virtual void EnsureBlinkInitialized() = 0;

[jochen (gone - plz use gerrit), 2015/07/27 11:35:21]

why is this API needed? why not just call initializeWithoutV8() where we used to
call initialize()?

[jam, 2015/07/27 15:14:49]

(see my first message)

to expand on it also, utility process is now for hosting many things that don't
use blink (i.e. mojo apps). so we shouldn't do the work of initializing blink if
we don't need to.

 };
 
 }  // namespace content