[Not for review] Discardable memory emulation

webkit/glue/webkitplatformsupport_impl.cc

 // Copyright (c) 2012 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 "webkit/glue/webkitplatformsupport_impl.h"
 
 #include <math.h>
 
 #include <vector>
 
@@ skipping 972 matching lines @@
   if (device_source == WebKit::WebGestureEvent::Touchscreen)
     return fling_curve_configuration_->CreateForTouchScreen(velocity,
                                                             cumulative_scroll);
 
   return fling_curve_configuration_->CreateForTouchPad(velocity,
                                                        cumulative_scroll);
 }
 
 WebKit::WebDiscardableMemory*
     WebKitPlatformSupportImpl::allocateAndLockDiscardableMemory(size_t bytes) {
-  if (!base::DiscardableMemory::Supported())
+  if (!base::DiscardableMemoryProvider::GetInstance())

[nduca, 2013/06/07 04:52:18]

lets seal this though behind base::DiscardableMemory::Supported. It'd be ideal
if the Provider part was hidden from the average user of the interface.

     return NULL;
   scoped_ptr<WebDiscardableMemoryImpl> discardable(
       new WebDiscardableMemoryImpl());
   if (discardable->InitializeAndLock(bytes))
     return discardable.release();
   return NULL;
 }
 
 #if defined(OS_ANDROID)
 webkit_media::WebAudioMediaCodecRunner
     WebKitPlatformSupportImpl::GetWebAudioMediaCodecRunner() {
   return base::Bind(&NullRunWebAudioMediaCodec);
 }
 #endif
 
 }  // namespace webkit_glue