Mojo: Add a platform interface for shared memory (embedder::PlatformSharedBuffer).

mojo/system/raw_shared_buffer_win.cc

 // Copyright 2014 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 "mojo/system/raw_shared_buffer.h"
 
 #include <windows.h>
 
 #include <limits>
 
@@ skipping 39 matching lines @@
 
 bool RawSharedBuffer::InitFromPlatformHandle(
     embedder::ScopedPlatformHandle platform_handle) {
   DCHECK(!handle_.is_valid());
 
   // TODO(vtl): Implement.
   NOTIMPLEMENTED();
   return false;
 }
 
-scoped_ptr<RawSharedBufferMapping> RawSharedBuffer::MapImpl(size_t offset,
-                                                            size_t length) {
+scoped_ptr<embedder::PlatformSharedBufferMapping> RawSharedBuffer::MapImpl(
+    size_t offset,
+    size_t length) {
   size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity();
   size_t real_offset = offset - offset_rounding;
   size_t real_length = length + offset_rounding;
 
   // This should hold (since we checked |num_bytes| versus the maximum value of
   // |off_t| on creation, but it never hurts to be paranoid.
   DCHECK_LE(static_cast<uint64_t>(real_offset),
             static_cast<uint64_t>(std::numeric_limits<DWORD>::max()));
 
   void* real_base = MapViewOfFile(handle_.get().handle,
                                   FILE_MAP_READ | FILE_MAP_WRITE,
                                   0,
                                   static_cast<DWORD>(real_offset),
                                   real_length);
   if (!real_base) {
     PLOG(ERROR) << "MapViewOfFile";
-    return scoped_ptr<RawSharedBufferMapping>();
+    return scoped_ptr<embedder::PlatformSharedBufferMapping>();
   }
 
   void* base = static_cast<char*>(real_base) + offset_rounding;
-  return make_scoped_ptr(
+  return scoped_ptr<embedder::PlatformSharedBufferMapping>(
       new RawSharedBufferMapping(base, length, real_base, real_length));
 }
 
 // RawSharedBufferMapping ------------------------------------------------------
 
 void RawSharedBufferMapping::Unmap() {
   BOOL result = UnmapViewOfFile(real_base_);
   PLOG_IF(ERROR, !result) << "UnmapViewOfFile";
 }
 
 }  // namespace system
 }  // namespace mojo