Update from https://crrev.com/327068

base/memory/discardable_memory.h

Index: base/memory/discardable_memory.h
diff --git a/base/memory/discardable_memory.h b/base/memory/discardable_memory.h
index a0882ccc94e9ab280ef3a82b9492cd0525b1bb9a..fc189e746341136d0190e0329d3c375be8500af2 100644
--- a/base/memory/discardable_memory.h
+++ b/base/memory/discardable_memory.h
@@ -52,8 +52,13 @@ class BASE_EXPORT DiscardableMemory {
   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