ui: Cleanup class/struct forward declarations

services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc

Index: services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
diff --git a/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc b/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
index 342670b1f499efa0be663afe2770642a8451ec4b..81b5620d7bc213fb1886251dda83f112af64c5e4 100644
--- a/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
+++ b/services/ui/public/cpp/mojo_gpu_memory_buffer_manager.cc
@@ -4,22 +4,69 @@
 
 #include "services/ui/public/cpp/mojo_gpu_memory_buffer_manager.h"
 
+#include "base/bind.h"
 #include "base/logging.h"
-#include "services/ui/public/cpp/mojo_gpu_memory_buffer.h"
+#include "base/memory/ptr_util.h"
+#include "base/memory/shared_memory.h"
+#include "gpu/ipc/client/gpu_memory_buffer_impl.h"
+#include "mojo/public/cpp/system/buffer.h"
+#include "mojo/public/cpp/system/platform_handle.h"
+#include "ui/gfx/buffer_format_util.h"
 
 namespace ui {
 
-MojoGpuMemoryBufferManager::MojoGpuMemoryBufferManager() {}
+MojoGpuMemoryBufferManager::MojoGpuMemoryBufferManager()
+    : weak_ptr_factory_(this) {}
 
 MojoGpuMemoryBufferManager::~MojoGpuMemoryBufferManager() {}
 
+void MojoGpuMemoryBufferManager::DeletedGpuMemoryBuffer(
+    gfx::GpuMemoryBufferId id,
+    const gpu::SyncToken& sync_token) {
+}
+
 std::unique_ptr<gfx::GpuMemoryBuffer>
 MojoGpuMemoryBufferManager::AllocateGpuMemoryBuffer(
     const gfx::Size& size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     gpu::SurfaceHandle surface_handle) {
-  return MojoGpuMemoryBufferImpl::Create(size, format, usage);
+  // TODO(sad): Get the memory buffer handle from GpuService.
+  size_t bytes = gfx::BufferSizeForBufferFormat(size, format);
+
+  mojo::ScopedSharedBufferHandle handle =
+      mojo::SharedBufferHandle::Create(bytes);
+  if (!handle.is_valid())
+    return nullptr;
+
+  base::SharedMemoryHandle shm_handle;
+  size_t shared_memory_size;
+  bool readonly;
+  MojoResult result = mojo::UnwrapSharedMemoryHandle(
+      std::move(handle), &shm_handle, &shared_memory_size, &readonly);
+  if (result != MOJO_RESULT_OK)
+    return nullptr;
+  DCHECK_EQ(shared_memory_size, bytes);
+
+  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 = gfx::GpuMemoryBufferId(++counter_);
+  gmb_handle.handle = shm_handle;
+  gmb_handle.offset = 0;
+  gmb_handle.stride = stride;
+
+  std::unique_ptr<gpu::GpuMemoryBufferImpl> buffer(
+      gpu::GpuMemoryBufferImpl::CreateFromHandle(
+          gmb_handle, size, format, usage,
+          base::Bind(&MojoGpuMemoryBufferManager::DeletedGpuMemoryBuffer,
+                     weak_ptr_factory_.GetWeakPtr(), gmb_handle.id)));
+  if (!buffer)
+    return nullptr;
+
+  return std::move(buffer);
 }
 
 std::unique_ptr<gfx::GpuMemoryBuffer>
@@ -27,20 +74,21 @@ MojoGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle(
     const gfx::GpuMemoryBufferHandle& handle,
     const gfx::Size& size,
     gfx::BufferFormat format) {
-  const gfx::BufferUsage usage = gfx::BufferUsage::GPU_READ;
-  return MojoGpuMemoryBufferImpl::CreateFromHandle(handle, size, format, usage);
+  NOTIMPLEMENTED();
+  return nullptr;
 }
 
 gfx::GpuMemoryBuffer*
 MojoGpuMemoryBufferManager::GpuMemoryBufferFromClientBuffer(
     ClientBuffer buffer) {
-  return MojoGpuMemoryBufferImpl::FromClientBuffer(buffer);
+  return gpu::GpuMemoryBufferImpl::FromClientBuffer(buffer);
 }
 
 void MojoGpuMemoryBufferManager::SetDestructionSyncToken(
     gfx::GpuMemoryBuffer* buffer,
     const gpu::SyncToken& sync_token) {
-  NOTIMPLEMENTED();
+  static_cast<gpu::GpuMemoryBufferImpl*>(buffer)->set_destruction_sync_token(
+      sync_token);
 }
 
 }  // namespace ui