Replacing allocate bitmap IPC messages with a new Mojo interface.

content/browser/renderer_host/shared_memory_allocator_impl.cc

+// Copyright 2016 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 "content/browser/renderer_host/shared_memory_allocator_impl.h"
+
+#include "content/public/browser/browser_thread.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/public/cpp/system/platform_handle.h"
+
+namespace content {
+
+void SharedMemoryAllocatorImpl::Create(
+    mojom::SharedMemoryAllocatorRequest request) {
+  mojo::MakeStrongBinding(
+      base::WrapUnique(new SharedMemoryAllocatorImpl()),
+      std::move(request));
+}
+
+SharedMemoryAllocatorImpl::SharedMemoryAllocatorImpl()
+    : bitmap_manager_client_(HostSharedBitmapManager::current()) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+SharedMemoryAllocatorImpl::~SharedMemoryAllocatorImpl() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+void SharedMemoryAllocatorImpl::AllocatedSharedBitmap(
+    mojo::ScopedSharedBufferHandle buffer,
+    const gpu::Mailbox& id) {
+  base::SharedMemoryHandle memory_handle;
+  size_t size;
+  MojoResult result = mojo::UnwrapSharedMemoryHandle(
+      std::move(buffer), &memory_handle, &size, NULL);
+  DCHECK_EQ(result, MOJO_RESULT_OK);
+  bitmap_manager_client_.ChildAllocatedSharedBitmap(size, memory_handle, id);
+}
+
+void SharedMemoryAllocatorImpl::DeletedSharedBitmap(const gpu::Mailbox& id) {
+  bitmap_manager_client_.ChildDeletedSharedBitmap(id);
+}
+
+}  // namespace content