Re-land: base: Use MADV_REMOVE instead of ftruncate to purge discardable memory segments.

base/memory/discardable_shared_memory.h

Index: base/memory/discardable_shared_memory.h
diff --git a/base/memory/discardable_shared_memory.h b/base/memory/discardable_shared_memory.h
index 5dca884ca82e2d6665930905c92e990b8a5515c2..ff93ee7d7c1b50bdcb7dd1e1026a80a121704a14 100644
--- a/base/memory/discardable_shared_memory.h
+++ b/base/memory/discardable_shared_memory.h
@@ -15,10 +15,11 @@
 #include <set>
 #endif
 
-// Define DISCARDABLE_SHARED_MEMORY_SHRINKING if platform supports shrinking
-// of discardable shared memory segments.
-#if defined(OS_POSIX) && !defined(OS_ANDROID)
-#define DISCARDABLE_SHARED_MEMORY_SHRINKING
+// Define DISCARDABLE_SHARED_MEMORY_REMOVE if platform supports MADV_REMOVE
+// and can remove resources associated with discardable shared memory when
+// purging a segment.
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+#define DISCARDABLE_SHARED_MEMORY_REMOVE
 #endif
 
 namespace base {
@@ -124,12 +125,6 @@ class BASE_EXPORT DiscardableSharedMemory {
     return shared_memory_.ShareToProcess(process_handle, new_handle);
   }
 
-#if defined(DISCARDABLE_SHARED_MEMORY_SHRINKING)
-  // Release as much memory as possible to the OS. The change in size will
-  // be reflected by the return value of mapped_size().
-  void Shrink();
-#endif
-
  private:
   // Virtual for tests.
   virtual Time Now() const;