First batch of GCC fixes for GPU code.

gpu/command_buffer/service/command_buffer_service.cc

 // Copyright (c) 2006-2008 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 "gpu/command_buffer/service/command_buffer_service.h"
 
 using ::base::SharedMemory;
 
 namespace command_buffer {
 
@@ skipping 64 matching lines @@
   put_offset_change_callback_.reset(callback);
 }
 
 int32 CommandBufferService::CreateTransferBuffer(size_t size) {
   linked_ptr<SharedMemory> buffer(new SharedMemory);
   if (!buffer->Create(std::wstring(), false, false, size))
     return -1;
 
   if (unused_registered_object_elements_.empty()) {
     // Check we haven't exceeded the range that fits in a 32-bit integer.
-    int32 handle = static_cast<int32>(registered_objects_.size());
-    if (handle != registered_objects_.size())
+    if (registered_objects_.size() > std::numeric_limits<uint32>::max())
       return -1;
 
+    int32 handle = static_cast<int32>(registered_objects_.size());
     registered_objects_.push_back(buffer);
     return handle;
   }
 
   int32 handle = *unused_registered_object_elements_.begin();
   unused_registered_object_elements_.erase(
       unused_registered_object_elements_.begin());
   DCHECK(!registered_objects_[handle].get());
   registered_objects_[handle] = buffer;
   return handle;
@@ skipping 51 matching lines @@
 
 bool CommandBufferService::GetErrorStatus() {
   return error_status_;
 }
 
 void CommandBufferService::RaiseErrorStatus() {
   error_status_ = true;
 }
 
 }  // namespace command_buffer