EGL: Add stubs for EGL_ANDROID_blob_cache

This change adds a stub cache implementation that gets passed to the
underlying EGL implementation at initialization time.

Change-Id: I14437c5b6f91b7a34a19bb02ad802e6e54f88d2a
diff --git a/opengl/libs/EGL/egl_cache.h b/opengl/libs/EGL/egl_cache.h
new file mode 100644
index 0000000..1fcfacc
--- /dev/null
+++ b/opengl/libs/EGL/egl_cache.h
@@ -0,0 +1,33 @@
+/*
+ ** Copyright 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.
+ */
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+class egl_display_t;
+
+class egl_cache_t {
+public:
+
+    static egl_cache_t* get();
+
+    void initialize(egl_display_t* display);
+};
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------