Move more GL state management to RenderState and its directory

Change-Id: Ic68584e1c08dc64be2ad43450cb6caa1de834fdc
diff --git a/libs/hwui/renderstate/PixelBufferState.h b/libs/hwui/renderstate/PixelBufferState.h
new file mode 100644
index 0000000..8dab21d
--- /dev/null
+++ b/libs/hwui/renderstate/PixelBufferState.h
@@ -0,0 +1,37 @@
+/*
+ * 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 RENDERSTATE_PIXELBUFFERSTATE_H
+#define RENDERSTATE_PIXELBUFFERSTATE_H
+
+#include <GLES3/gl3.h>
+
+namespace android {
+namespace uirenderer {
+
+class PixelBufferState {
+    friend class Caches; // TODO: move to RenderState
+public:
+    bool bind(GLuint buffer);
+    bool unbind();
+private:
+    PixelBufferState();
+    GLuint mCurrentPixelBuffer;
+};
+
+} /* namespace uirenderer */
+} /* namespace android */
+
+#endif // RENDERSTATE_PIXELBUFFERSTATE_H