[Android] Set V8 is_memory_constrained ResourceConstraint on Android.

content/renderer/render_thread_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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 109 matching lines @@
 #include "base/memory/scoped_handle.h"
 #include "content/child/npapi/np_channel_base.h"
 #endif
 
 #if defined(OS_POSIX)
 #include "ipc/ipc_channel_posix.h"
 #endif
 
 #if defined(OS_ANDROID)
 #include <cpu-features.h>
+#include "base/android/sys_utils.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
 #endif
 
 #if defined(ENABLE_PLUGINS)
 #include "content/renderer/npapi/plugin_channel_host.h"
 #endif
 
 using base::ThreadRestrictions;
 using WebKit::WebDocument;
 using WebKit::WebFrame;
@@ skipping 176 matching lines @@
   TRACE_EVENT_BEGIN_ETW("RenderThreadImpl::Init", 0, "");
 
   base::debug::TraceLog::GetInstance()->SetThreadSortIndex(
       base::PlatformThread::CurrentId(),
       kTraceEventRendererMainThreadSortIndex);
 
   v8::V8::SetCounterFunction(base::StatsTable::FindLocation);
   v8::V8::SetCreateHistogramFunction(CreateHistogram);
   v8::V8::SetAddHistogramSampleFunction(AddHistogramSample);
 
+#if defined(OS_ANDROID)
+  bool is_memory_constrained = base::android::SysUtils::IsLowEndDevice();
+  v8::ResourceConstraints resourceConstraints;
+  resourceConstraints.set_memory_constrained(&is_memory_constrained);

[jamesr, 2013/09/06 00:24:04]

can you please show me where this API is provided?  I don't see it in
https://code.google.com/p/v8/source/browse/trunk/include/v8.h

+  v8::SetResourceConstraints(&resourceConstraints);
+#endif
+
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   // On Mac and Android, the select popups are rendered by the browser.
   WebKit::WebView::setUseExternalPopupMenus(true);
 #endif
 
   lazy_tls.Pointer()->Set(this);
 
 #if defined(OS_WIN)
   // If you are running plugins in this thread you need COM active but in
   // the normal case you don't.
@@ skipping 971 matching lines @@
 
 }
 
 void RenderThreadImpl::SampleGamepads(WebKit::WebGamepads* data) {
   if (!gamepad_shared_memory_reader_)
     gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader);
   gamepad_shared_memory_reader_->SampleGamepads(*data);
 }
 
 }  // namespace content