Update from https://crrev.com/327068

base/memory/discardable_memory.h

 // Copyright (c) 2013 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 BASE_MEMORY_DISCARDABLE_MEMORY_H_
 #define BASE_MEMORY_DISCARDABLE_MEMORY_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 34 matching lines @@
   // Locks the memory so that it will not be purged by the system. Returns
   // true on success. If the return value is false then this object should be
   // discarded and a new one should be created.
   virtual bool Lock() WARN_UNUSED_RESULT = 0;
 
   // Unlocks the memory so that it can be purged by the system. Must be called
   // after every successful lock call.
   virtual void Unlock() = 0;
 
   // Returns the memory address held by this object. The object must be locked
-  // before calling this. Otherwise, this will cause a DCHECK error.
-  virtual void* Memory() const = 0;
+  // before calling this.
+  virtual void* data() const = 0;
+
+  // Handy method to simplify calling data() with a reinterpret_cast.
+  template<typename T> T* data_as() const {
+    return reinterpret_cast<T*>(data());
+  }
 };
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_H_