Expose the virtual memory limit to blink

content/child/blink_platform_impl.h

 // 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.
 
 #ifndef CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
 #include "base/platform_file.h"
@@ skipping 41 matching lines @@
       const blink::WebString& vfs_file_name);
   virtual long long databaseGetFileSize(const blink::WebString& vfs_file_name);
   virtual long long databaseGetSpaceAvailableForOrigin(
       const blink::WebString& origin_identifier);
   virtual blink::WebString signedPublicKeyAndChallengeString(
       unsigned key_size_index, const blink::WebString& challenge,
       const blink::WebURL& url);
   virtual size_t memoryUsageMB();
   virtual size_t actualMemoryUsageMB();
   virtual size_t physicalMemoryMB();
+  virtual size_t virtualMemoryLimitMB();
   virtual size_t numberOfProcessors();
 
   virtual void startHeapProfiling(const blink::WebString& prefix);
   virtual void stopHeapProfiling() OVERRIDE;
   virtual void dumpHeapProfiling(const blink::WebString& reason);
   virtual blink::WebString getHeapProfile() OVERRIDE;
 
   virtual bool processMemorySizesInBytes(size_t* private_bytes,
                                          size_t* shared_bytes);
   virtual bool memoryAllocatorWasteInBytes(size_t* size);
@@ skipping 90 matching lines @@
   bool shared_timer_fire_time_was_set_while_suspended_;
   int shared_timer_suspended_;  // counter
   scoped_ptr<FlingCurveConfiguration> fling_curve_configuration_;
   base::ThreadLocalStorage::Slot current_thread_slot_;
   scoped_ptr<WebCryptoImpl> web_crypto_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_