Revert of gpu: guarantee to match pending GBM buffer request to actual GBM handle

content/browser/gpu/gpu_process_host.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/browser/gpu/gpu_process_host.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 718 matching lines @@
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     int client_id,
     gpu::SurfaceHandle surface_handle,
     const CreateGpuMemoryBufferCallback& callback) {
   TRACE_EVENT0("gpu", "GpuProcessHost::CreateGpuMemoryBuffer");
 
   DCHECK(CalledOnValidThread());
-  DCHECK(create_gpu_memory_buffer_requests_.find(id) ==
-         create_gpu_memory_buffer_requests_.end());
-  create_gpu_memory_buffer_requests_[id] = callback;
+  create_gpu_memory_buffer_requests_.push(callback);
   gpu_service_ptr_->CreateGpuMemoryBuffer(
       id, size, format, usage, client_id, surface_handle,
       base::Bind(&GpuProcessHost::OnGpuMemoryBufferCreated,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void GpuProcessHost::DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                             int client_id,
                                             const gpu::SyncToken& sync_token) {
   TRACE_EVENT0("gpu", "GpuProcessHost::DestroyGpuMemoryBuffer");
@@ skipping 35 matching lines @@
   }
 
   callback.Run(IPC::ChannelHandle(channel_handle.release()), gpu_info_,
                EstablishChannelStatus::SUCCESS);
 }
 
 void GpuProcessHost::OnGpuMemoryBufferCreated(
     const gfx::GpuMemoryBufferHandle& handle) {
   TRACE_EVENT0("gpu", "GpuProcessHost::OnGpuMemoryBufferCreated");
 
-  if (create_gpu_memory_buffer_requests_.find(handle.id) ==
-      create_gpu_memory_buffer_requests_.end()) {
-    DVLOG(1) << "GpuMemoryBuffer creation fails due to missing callback.";
-    return;
-  }
-
-  auto callback = create_gpu_memory_buffer_requests_[handle.id];
-  create_gpu_memory_buffer_requests_.erase(handle.id);
+  DCHECK(!create_gpu_memory_buffer_requests_.empty());
+  auto callback = create_gpu_memory_buffer_requests_.front();
+  create_gpu_memory_buffer_requests_.pop();
   callback.Run(handle, BufferCreationStatus::SUCCESS);
 }
 
 #if defined(OS_ANDROID)
 void GpuProcessHost::OnDestroyingVideoSurfaceAck() {
   TRACE_EVENT0("gpu", "GpuProcessHost::OnDestroyingVideoSurfaceAck");
   if (!send_destroying_video_surface_done_cb_.is_null())
     base::ResetAndReturn(&send_destroying_video_surface_done_cb_).Run();
 }
 #endif
@@ skipping 262 matching lines @@
   valid_ = false;
 
   // First send empty channel handles for all EstablishChannel requests.
   while (!channel_requests_.empty()) {
     auto callback = channel_requests_.front();
     channel_requests_.pop();
     callback.Run(IPC::ChannelHandle(), gpu::GPUInfo(),
                  EstablishChannelStatus::GPU_HOST_INVALID);
   }
 
-  for (auto& pair : create_gpu_memory_buffer_requests_) {
-    auto callback = pair.second;
+  while (!create_gpu_memory_buffer_requests_.empty()) {
+    auto callback = create_gpu_memory_buffer_requests_.front();
+    create_gpu_memory_buffer_requests_.pop();
     callback.Run(gfx::GpuMemoryBufferHandle(),
                  BufferCreationStatus::GPU_HOST_INVALID);
   }
-  create_gpu_memory_buffer_requests_.clear();
 
   if (!send_destroying_video_surface_done_cb_.is_null())
     base::ResetAndReturn(&send_destroying_video_surface_done_cb_).Run();
 }
 
 void GpuProcessHost::BlockLiveOffscreenContexts() {
   for (std::multiset<GURL>::iterator iter =
            urls_with_live_offscreen_contexts_.begin();
        iter != urls_with_live_offscreen_contexts_.end(); ++iter) {
     GpuDataManagerImpl::GetInstance()->BlockDomainFrom3DAPIs(
@@ skipping 111 matching lines @@
   if (!cache.get())
     return;
 
   cache->set_shader_loaded_callback(base::Bind(&GpuProcessHost::LoadedShader,
                                                weak_ptr_factory_.GetWeakPtr()));
 
   client_id_to_shader_cache_[client_id] = cache;
 }
 
 }  // namespace content