diff -r 000000000000 -r 6474c204b198 gfx/angle/src/compiler/MapLongVariableNames.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/compiler/MapLongVariableNames.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,132 @@
+//
+// Copyright (c) 2002-2012 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.
+//
+
+#include "compiler/MapLongVariableNames.h"
+
+#include "third_party/murmurhash/MurmurHash3.h"
+
+namespace {
+
+TString mapLongName(size_t id, const TString& name, bool isGlobal)
+{
+    ASSERT(name.size() > MAX_SHORTENED_IDENTIFIER_SIZE);
+    TStringStream stream;
+
+    uint64_t hash[2] = {0, 0};
+    MurmurHash3_x64_128(name.data(), name.length(), 0, hash);
+
+    // We want to avoid producing a string with a double underscore,
+    // which would be an illegal GLSL identifier. We can assume that the
+    // original identifier doesn't have a double underscore, otherwise
+    // it's illegal anyway.
+    stream << (name[0] == '_' ? "webgl" : "webgl_")
+           << name.substr(0, 9)
+           << (name[8] == '_' ? "" : "_")
+           << std::hex
+           << hash[0];
+    ASSERT(stream.str().length() <= MAX_SHORTENED_IDENTIFIER_SIZE);
+    ASSERT(stream.str().length() >= MAX_SHORTENED_IDENTIFIER_SIZE - 2);
+    return stream.str();
+}
+
+LongNameMap* gLongNameMapInstance = NULL;
+
+}  // anonymous namespace
+
+LongNameMap::LongNameMap()
+    : refCount(0)
+{
+}
+
+LongNameMap::~LongNameMap()
+{
+}
+
+// static
+LongNameMap* LongNameMap::GetInstance()
+{
+    if (gLongNameMapInstance == NULL)
+        gLongNameMapInstance = new LongNameMap;
+    gLongNameMapInstance->refCount++;
+    return gLongNameMapInstance;
+}
+
+void LongNameMap::Release()
+{
+    ASSERT(gLongNameMapInstance == this);
+    ASSERT(refCount > 0);
+    refCount--;
+    if (refCount == 0) {
+        delete gLongNameMapInstance;
+        gLongNameMapInstance = NULL;
+    }
+}
+
+const char* LongNameMap::Find(const char* originalName) const
+{
+    std::map<std::string, std::string>::const_iterator it = mLongNameMap.find(
+        originalName);
+    if (it != mLongNameMap.end())
+        return (*it).second.c_str();
+    return NULL;
+}
+
+void LongNameMap::Insert(const char* originalName, const char* mappedName)
+{
+    mLongNameMap.insert(std::map<std::string, std::string>::value_type(
+        originalName, mappedName));
+}
+
+size_t LongNameMap::Size() const
+{
+    return mLongNameMap.size();
+}
+
+MapLongVariableNames::MapLongVariableNames(LongNameMap* globalMap)
+{
+    ASSERT(globalMap);
+    mGlobalMap = globalMap;
+}
+
+void MapLongVariableNames::visitSymbol(TIntermSymbol* symbol)
+{
+    ASSERT(symbol != NULL);
+    if (symbol->getSymbol().size() > MAX_SHORTENED_IDENTIFIER_SIZE) {
+        switch (symbol->getQualifier()) {
+          case EvqVaryingIn:
+          case EvqVaryingOut:
+          case EvqInvariantVaryingIn:
+          case EvqInvariantVaryingOut:
+          case EvqUniform:
+            symbol->setSymbol(
+                mapGlobalLongName(symbol->getSymbol()));
+            break;
+          default:
+            symbol->setSymbol(
+                mapLongName(symbol->getId(), symbol->getSymbol(), false));
+            break;
+        };
+    }
+}
+
+bool MapLongVariableNames::visitLoop(Visit, TIntermLoop* node)
+{
+    if (node->getInit())
+        node->getInit()->traverse(this);
+    return true;
+}
+
+TString MapLongVariableNames::mapGlobalLongName(const TString& name)
+{
+    ASSERT(mGlobalMap);
+    const char* mappedName = mGlobalMap->Find(name.c_str());
+    if (mappedName != NULL)
+        return mappedName;
+    size_t id = mGlobalMap->Size();
+    TString rt = mapLongName(id, name, true);
+    mGlobalMap->Insert(name.c_str(), rt.c_str());
+    return rt;
+}