Unify extensions parsing behavior

Removes remnants of EGL extension support, and persistence of
GL extension list.

Change-Id: I35aec12d900bdb33549ea47654bb8146f350ef48
diff --git a/libs/hwui/utils/StringUtils.h b/libs/hwui/utils/StringUtils.h
new file mode 100644
index 0000000..ef2a6d5
--- /dev/null
+++ b/libs/hwui/utils/StringUtils.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+#ifndef STRING_UTILS_H
+#define STRING_UTILS_H
+
+#include <string>
+#include <unordered_set>
+
+namespace android {
+namespace uirenderer {
+
+class StringCollection {
+public:
+    StringCollection(const char* spacedList);
+    bool has(const char* string);
+private:
+    std::unordered_set<std::string> mSet;
+};
+
+} /* namespace uirenderer */
+} /* namespace android */
+
+#endif /* GLUTILS_H */