Android: Get rid of extra dup()s on launching child processes

content/public/browser/file_descriptor_info.h

Index: content/public/browser/file_descriptor_info.h
diff --git a/content/public/browser/file_descriptor_info.h b/content/public/browser/file_descriptor_info.h
index b0b2bdad7dc0c5baf15f872584e1e0c0cd953192..76c546e40b2934271daaac301a4155c0277577bb 100644
--- a/content/public/browser/file_descriptor_info.h
+++ b/content/public/browser/file_descriptor_info.h
@@ -41,6 +41,11 @@ class FileDescriptorInfo {
   virtual base::PlatformFile GetFDAt(size_t i) const = 0;
   virtual int GetIDAt(size_t i) const = 0;
   virtual size_t GetMappingSize() const = 0;
+
+  // True if |this| has an ownership of |file|.
+  virtual bool OwnsFD(base::PlatformFile file) const = 0;
+  // Assuming |OwnsFD(file)|, release the ownership.
+  virtual base::ScopedFD ReleaseFD(base::PlatformFile file) = 0;
 };
 
 }