emulator: opengl: Back-port GLES emulation from the master tree.

The modules here are only built when BUILD_EMULATOR_OPENGL is defined to true
in your environment or your BoardConfig.mk (see tools/emulator/opengl/Android.mk)

Change-Id: I5f32c35b4452fb5a7b4d5f9fc5870ec1da6032e6

tools/emulator/opengl/system/OpenglSystemCommon/ThreadInfo.cpp

@@ -0,0 +1,39 @@
+/*
+* Copyright (C) 2011 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+#include "ThreadInfo.h"
+#include "cutils/threads.h"
+
+thread_store_t s_tls = THREAD_STORE_INITIALIZER;
+
+static void tlsDestruct(void *ptr)
+{
+    if (ptr) {
+        EGLThreadInfo *ti = (EGLThreadInfo *)ptr;
+        delete ti->hostConn;
+        delete ti;
+    }
+}
+
+EGLThreadInfo *slow_getEGLThreadInfo()
+{
+    EGLThreadInfo *ti = (EGLThreadInfo *)thread_store_get(&s_tls);
+    if (ti) return ti;
+
+    ti = new EGLThreadInfo();
+    thread_store_set(&s_tls, ti, tlsDestruct);
+
+    return ti;
+}