Expose the virtual memory limit to blink

content/child/blink_platform_impl.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 "content/child/blink_platform_impl.h"
 
 #include <math.h>
 
 #include <vector>
 
@@ skipping 925 matching lines @@
 }
 
 size_t BlinkPlatformImpl::actualMemoryUsageMB() {
   return getMemoryUsageMB(true);
 }
 
 size_t BlinkPlatformImpl::physicalMemoryMB() {
   return static_cast<size_t>(base::SysInfo::AmountOfPhysicalMemoryMB());
 }
 
+size_t BlinkPlatformImpl::virtualMemoryLimitMB() {
+  return static_cast<size_t>(base::SysInfo::AmountOfVirtualMemoryMB());
+}
+
 size_t BlinkPlatformImpl::numberOfProcessors() {
   return static_cast<size_t>(base::SysInfo::NumberOfProcessors());
 }
 
 void BlinkPlatformImpl::startHeapProfiling(
   const blink::WebString& prefix) {
   // FIXME(morrita): Make this built on windows.
 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
   HeapProfilerStart(prefix.utf8().data());
 #endif
@@ skipping 86 matching lines @@
 }
 
 // static
 void BlinkPlatformImpl::DestroyCurrentThread(void* thread) {
   WebThreadImplForMessageLoop* impl =
       static_cast<WebThreadImplForMessageLoop*>(thread);
   delete impl;
 }
 
 }  // namespace content