base: Discardable memory types.

base/memory/discardable_memory_linux.cc

Index: base/memory/discardable_memory_linux.cc
diff --git a/base/memory/discardable_memory_linux.cc b/base/memory/discardable_memory_linux.cc
index 92e39e5e7d421f3f7acd67ae39b7c9e95b060cd2..33c85bdcb86450e16c8463ea553c689ea113b609 100644
--- a/base/memory/discardable_memory_linux.cc
+++ b/base/memory/discardable_memory_linux.cc
@@ -2,24 +2,42 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/memory/discardable_memory.h"
+
+#include "base/logging.h"
 #include "base/memory/discardable_memory_emulated.h"
 
 namespace base {
 
 // static
-bool DiscardableMemory::SupportedNatively() {
-  return false;
+void DiscardableMemory::GetSupportedTypes(
+    std::vector<DiscardableMemoryType>* types) {
+  const DiscardableMemoryType supported_types[] = {
+    DISCARDABLE_MEMORY_TYPE_EMULATED
+  };
+  types->assign(supported_types, supported_types + arraysize(supported_types));
 }
 
 // static
-scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemory(
-    size_t size) {
-  scoped_ptr<internal::DiscardableMemoryEmulated> memory(
-      new internal::DiscardableMemoryEmulated(size));
-  if (!memory->Initialize())
-    return scoped_ptr<DiscardableMemory>();
-
-  return memory.PassAs<DiscardableMemory>();
+scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemoryWithType(
+    DiscardableMemoryType type, size_t size) {
+  switch (type) {
+    case DISCARDABLE_MEMORY_TYPE_NONE:
+    case DISCARDABLE_MEMORY_TYPE_ANDROID:
+    case DISCARDABLE_MEMORY_TYPE_MAC:
+      return scoped_ptr<DiscardableMemory>();
+    case DISCARDABLE_MEMORY_TYPE_EMULATED: {
+      scoped_ptr<internal::DiscardableMemoryEmulated> memory(
+          new internal::DiscardableMemoryEmulated(size));
+      if (!memory->Initialize())
+        return scoped_ptr<DiscardableMemory>();
+
+      return memory.PassAs<DiscardableMemory>();
+    }
+  }
+
+  NOTREACHED();
+  return scoped_ptr<DiscardableMemory>();
 }
 
 // static