Add GenericSharedMemoryId and use w/ GpuMemoryBuffer

content/common/child_process_host_impl.cc

 // Copyright (c) 2012 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/common/child_process_host_impl.h"
 
 #include <limits>
 
 #include "base/atomic_sequence_num.h"
 #include "base/command_line.h"
@@ skipping 69 matching lines @@
                                      .Append(kMacOSName)
                                      .Append(new_basename);
 
   return new_path;
 }
 #endif  // OS_MACOSX
 
 // Global atomic to generate child process unique IDs.
 base::StaticAtomicSequenceNumber g_unique_id;
 
-// Global atomic to generate gpu memory buffer unique IDs.
-base::StaticAtomicSequenceNumber g_next_gpu_memory_buffer_id;
-
 }  // namespace
 
 namespace content {
 
 int ChildProcessHost::kInvalidUniqueID = -1;
 
 uint64 ChildProcessHost::kBrowserTracingProcessId =
     std::numeric_limits<uint64>::max();
 
 // static
@@ skipping 248 matching lines @@
     base::SharedMemoryHandle* handle) {
   AllocateSharedMemory(buffer_size, peer_process_.Handle(), handle);
 }
 
 void ChildProcessHostImpl::OnShutdownRequest() {
   if (delegate_->CanShutdown())
     Send(new ChildProcessMsg_Shutdown());
 }
 
 void ChildProcessHostImpl::OnAllocateGpuMemoryBuffer(
+    gfx::GpuMemoryBufferId id,
     uint32 width,
     uint32 height,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     gfx::GpuMemoryBufferHandle* handle) {
   // TODO(reveman): Add support for other types of GpuMemoryBuffers.
 
   // AllocateForChildProcess() will check if |width| and |height| are valid
   // and handle failure in a controlled way when not. We just need to make
   // sure |format| and |usage| are supported here.
   if (GpuMemoryBufferImplSharedMemory::IsFormatSupported(format) &&
       GpuMemoryBufferImplSharedMemory::IsUsageSupported(usage)) {
     *handle = GpuMemoryBufferImplSharedMemory::AllocateForChildProcess(
-        g_next_gpu_memory_buffer_id.GetNext(), gfx::Size(width, height), format,
-        peer_process_.Handle());
+        id, gfx::Size(width, height), format, peer_process_.Handle());
   }
 }
 
 void ChildProcessHostImpl::OnDeletedGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     uint32 sync_point) {
   // Note: Nothing to do here as ownership of shared memory backed
   // GpuMemoryBuffers is passed with IPC.
 }
 
 }  // namespace content