Add a size parameter to SharedMemoryHandle.

mojo/public/cpp/system/platform_handle.cc

 // Copyright 2016 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/public/cpp/system/platform_handle.h"
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 #include <mach/mach.h>
 #include "base/mac/mach_logging.h"
 #endif
@@ skipping 106 matching lines @@
   // TODO(rockot): Pass GUIDs through Mojo. https://crbug.com/713763.
   base::UnguessableToken guid = base::UnguessableToken::Create();
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_MACH_PORT);
   *memory_handle = base::SharedMemoryHandle(
       static_cast<mach_port_t>(platform_handle.value), num_bytes, guid);
 #elif defined(OS_POSIX)
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_FILE_DESCRIPTOR);
   *memory_handle = base::SharedMemoryHandle(
       base::FileDescriptor(static_cast<int>(platform_handle.value), false),
-      guid);
+      num_bytes, guid);
 #elif defined(OS_WIN)
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE);
   *memory_handle = base::SharedMemoryHandle(
-      reinterpret_cast<HANDLE>(platform_handle.value), guid);
+      reinterpret_cast<HANDLE>(platform_handle.value), num_bytes, guid);
 #endif
 
   return MOJO_RESULT_OK;
 }
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 ScopedHandle WrapMachPort(mach_port_t port) {
   kern_return_t kr =
       mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_SEND, 1);
   MACH_LOG_IF(ERROR, kr != KERN_SUCCESS, kr)
@@ skipping 21 matching lines @@
   if (result != MOJO_RESULT_OK)
     return result;
 
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_MACH_PORT);
   *port = static_cast<mach_port_t>(platform_handle.value);
   return MOJO_RESULT_OK;
 }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
 }  // namespace mojo