Revert "Delete CC."

cc/resources/texture_mailbox_deleter.cc

+// Copyright 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.
+
+#include "cc/resources/texture_mailbox_deleter.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "cc/output/context_provider.h"
+#include "cc/resources/single_release_callback.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+
+namespace cc {
+
+static void DeleteTextureOnImplThread(
+    const scoped_refptr<ContextProvider>& context_provider,
+    unsigned texture_id,
+    uint32 sync_point,
+    bool is_lost) {
+  if (sync_point)
+    context_provider->ContextGL()->WaitSyncPointCHROMIUM(sync_point);
+  context_provider->ContextGL()->DeleteTextures(1, &texture_id);
+}
+
+static void PostTaskFromMainToImplThread(
+    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
+    ReleaseCallback run_impl_callback,
+    unsigned sync_point,
+    bool is_lost) {
+  // This posts the task to RunDeleteTextureOnImplThread().
+  impl_task_runner->PostTask(
+      FROM_HERE, base::Bind(run_impl_callback, sync_point, is_lost));
+}
+
+TextureMailboxDeleter::TextureMailboxDeleter(
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
+    : impl_task_runner_(task_runner), weak_ptr_factory_(this) {}
+
+TextureMailboxDeleter::~TextureMailboxDeleter() {
+  for (size_t i = 0; i < impl_callbacks_.size(); ++i)
+    impl_callbacks_.at(i)->Run(0, true);
+}
+
+scoped_ptr<SingleReleaseCallback> TextureMailboxDeleter::GetReleaseCallback(
+    const scoped_refptr<ContextProvider>& context_provider,
+    unsigned texture_id) {
+  // This callback owns a reference on the |context_provider|. It must be
+  // destroyed on the impl thread. Upon destruction of this class, the
+  // callback must immediately be destroyed.
+  scoped_ptr<SingleReleaseCallback> impl_callback =
+      SingleReleaseCallback::Create(base::Bind(&DeleteTextureOnImplThread,
+                                               context_provider,
+                                               texture_id));
+
+  impl_callbacks_.push_back(impl_callback.Pass());
+
+  // The raw pointer to the impl-side callback is valid as long as this
+  // class is alive. So we guard it with a WeakPtr.
+  ReleaseCallback run_impl_callback(
+      base::Bind(&TextureMailboxDeleter::RunDeleteTextureOnImplThread,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 impl_callbacks_.back()));
+
+  // Provide a callback for the main thread that posts back to the impl
+  // thread.
+  scoped_ptr<SingleReleaseCallback> main_callback =
+      SingleReleaseCallback::Create(base::Bind(
+          &PostTaskFromMainToImplThread, impl_task_runner_, run_impl_callback));
+
+  return main_callback.Pass();
+}
+
+void TextureMailboxDeleter::RunDeleteTextureOnImplThread(
+    SingleReleaseCallback* impl_callback,
+    unsigned sync_point,
+    bool is_lost) {
+  for (size_t i = 0; i < impl_callbacks_.size(); ++i) {
+    if (impl_callbacks_.at(i) == impl_callback) {
+      // Run the callback, then destroy it here on the impl thread.
+      impl_callbacks_.at(i)->Run(sync_point, is_lost);
+      impl_callbacks_.erase(impl_callbacks_.begin() + i);
+      return;
+    }
+  }
+
+  NOTREACHED() << "The Callback returned by GetDeleteCallback() was called "
+               << "more than once.";
+}
+
+}  // namespace cc