diff -r 000000000000 -r 6474c204b198 gfx/angle/src/libGLESv2/HandleAllocator.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/libGLESv2/HandleAllocator.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,64 @@
+#include "precompiled.h"
+//
+// Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// HandleAllocator.cpp: Implements the gl::HandleAllocator class, which is used
+// to allocate GL handles.
+
+#include "libGLESv2/HandleAllocator.h"
+
+#include "libGLESv2/main.h"
+
+namespace gl
+{
+
+HandleAllocator::HandleAllocator() : mBaseValue(1), mNextValue(1)
+{
+}
+
+HandleAllocator::~HandleAllocator()
+{
+}
+
+void HandleAllocator::setBaseHandle(GLuint value)
+{
+    ASSERT(mBaseValue == mNextValue);
+    mBaseValue = value;
+    mNextValue = value;
+}
+
+GLuint HandleAllocator::allocate()
+{
+    if (mFreeValues.size())
+    {
+        GLuint handle = mFreeValues.back();
+        mFreeValues.pop_back();
+        return handle;
+    }
+    return mNextValue++;
+}
+
+void HandleAllocator::release(GLuint handle)
+{
+    if (handle == mNextValue - 1)
+    {
+        // Don't drop below base value
+        if(mNextValue > mBaseValue)
+        {
+            mNextValue--;
+        }
+    }
+    else
+    {
+        // Only free handles that we own - don't drop below the base value
+        if (handle >= mBaseValue)
+        {
+            mFreeValues.push_back(handle);
+        }
+    }
+}
+
+}