gpu: Reuse existing code for shared memory allocation.

services/ui/ws/gpu_service_proxy.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 "services/ui/ws/gpu_service_proxy.h"
 
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 92 matching lines @@
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     const mojom::GpuService::CreateGpuMemoryBufferCallback& callback) {
   // TODO(sad): Check to see if native gpu memory buffer can be used first.
   if (!gpu::GpuMemoryBufferImplSharedMemory::IsUsageSupported(usage) ||
       !gpu::GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(size,
                                                                   format)) {
     callback.Run(gfx::GpuMemoryBufferHandle());
     return;
   }
-
-  size_t bytes = 0;
-  if (!gfx::BufferSizeForBufferFormatChecked(size, format, &bytes)) {
-    callback.Run(gfx::GpuMemoryBufferHandle());
-    return;
-  }
-
-  mojo::ScopedSharedBufferHandle mojo_handle =
-      mojo::SharedBufferHandle::Create(bytes);
-  if (!mojo_handle.is_valid()) {
-    callback.Run(gfx::GpuMemoryBufferHandle());
-    return;
-  }
-
-  base::SharedMemoryHandle shm_handle;
-  size_t shm_size;
-  bool readonly;
-  MojoResult result = mojo::UnwrapSharedMemoryHandle(
-      std::move(mojo_handle), &shm_handle, &shm_size, &readonly);
-  if (result != MOJO_RESULT_OK) {
-    callback.Run(gfx::GpuMemoryBufferHandle());
-    return;
-  }
-  DCHECK_EQ(shm_size, bytes);
-  DCHECK(!readonly);
-  const int stride = base::checked_cast<int>(
-      gfx::RowSizeForBufferFormat(size.width(), format, 0));
-
-  gfx::GpuMemoryBufferHandle gmb_handle;
-  gmb_handle.type = gfx::SHARED_MEMORY_BUFFER;
-  gmb_handle.id = id;
-  gmb_handle.handle = shm_handle;
-  gmb_handle.offset = 0;
-  gmb_handle.stride = stride;
-  callback.Run(gmb_handle);
+  callback.Run(gpu::GpuMemoryBufferImplSharedMemory::AllocateForChildProcess(
+      id, size, format));
 }
 
 void GpuServiceProxy::DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                              const gpu::SyncToken& sync_token) {
   //  NOTIMPLEMENTED();
 }
 
 bool GpuServiceProxy::IsMainThread() {
   return main_thread_task_runner_->BelongsToCurrentThread();
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 GpuServiceProxy::GetIOThreadTaskRunner() {
   return io_thread_->task_runner();
 }
 
 std::unique_ptr<base::SharedMemory> GpuServiceProxy::AllocateSharedMemory(
     size_t size) {
   std::unique_ptr<base::SharedMemory> shm(new base::SharedMemory());
   if (!shm->CreateAnonymous(size))
     shm.reset();
   return shm;
 }
 
 }  // namespace ws
 }  // namespace ui