Move discardable memory to //components from //content

content/child/child_thread_impl.cc

Index: content/child/child_thread_impl.cc
diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index 308da5ede883910780b84b0e30aa878a1970cc5e..927427d2d59ebb1036ed206723f3800312d0f9f4 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -32,8 +32,8 @@
 #include "base/timer/elapsed_timer.h"
 #include "base/tracked_objects.h"
 #include "build/build_config.h"
+#include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
 #include "components/tracing/child/child_trace_message_filter.h"
-#include "content/child/child_discardable_shared_memory_manager.h"
 #include "content/child/child_histogram_message_filter.h"
 #include "content/child/child_process.h"
 #include "content/child/child_resource_message_filter.h"
@@ -354,6 +354,33 @@ bool ChildThreadImpl::ChildThreadMessageRouter::RouteMessage(
   return handled;
 }
 
+class ChildThreadImpl::ClientDiscardableSharedMemoryManagerDelegate
+    : public discardable_memory::ClientDiscardableSharedMemoryManager::
+          Delegate {
+ public:
+  explicit ClientDiscardableSharedMemoryManagerDelegate(
+      scoped_refptr<ThreadSafeSender> sender)
+      : sender_(sender) {}
+  ~ClientDiscardableSharedMemoryManagerDelegate() override {}
+
+  void AllocateLockedDiscardableSharedMemory(
+      size_t size,
+      discardable_memory::DiscardableSharedMemoryId id,
+      base::SharedMemoryHandle* handle) override {
+    sender_->Send(
+        new ChildProcessHostMsg_SyncAllocateLockedDiscardableSharedMemory(
+            size, id, handle));
+  }
+
+  void DeletedDiscardableSharedMemory(
+      discardable_memory::DiscardableSharedMemoryId id) override {
+    sender_->Send(new ChildProcessHostMsg_DeletedDiscardableSharedMemory(id));
+  }
+
+ private:
+  scoped_refptr<ThreadSafeSender> sender_;
+};
+
 ChildThreadImpl::ChildThreadImpl()
     : route_provider_binding_(this),
       associated_interface_provider_bindings_(
@@ -564,8 +591,12 @@ void ChildThreadImpl::Init(const Options& options) {
   shared_bitmap_manager_.reset(
       new ChildSharedBitmapManager(thread_safe_sender()));
 
-  discardable_shared_memory_manager_.reset(
-      new ChildDiscardableSharedMemoryManager(thread_safe_sender()));
+  client_discardable_shared_memory_manager_delegate_ =
+      base::MakeUnique<ClientDiscardableSharedMemoryManagerDelegate>(
+          thread_safe_sender());
+  discardable_shared_memory_manager_ = base::MakeUnique<
+      discardable_memory::ClientDiscardableSharedMemoryManager>(
+      client_discardable_shared_memory_manager_delegate_.get());
 }
 
 ChildThreadImpl::~ChildThreadImpl() {