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diff --git a/libs/hwui/utils/TestWindowContext.h b/libs/hwui/utils/TestWindowContext.h
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+++ b/libs/hwui/utils/TestWindowContext.h
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+/*
+ * 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 TESTWINDOWCONTEXT_H_
+#define TESTWINDOWCONTEXT_H_
+
+#include <cutils/compiler.h>
+
+class SkBitmap;
+class SkCanvas;
+
+namespace android {
+
+namespace uirenderer {
+
+/**
+  Wraps all libui/libgui classes and types that external tests depend on,
+  exposing only primitive Skia types.
+*/
+
+class ANDROID_API TestWindowContext {
+
+public:
+
+    TestWindowContext();
+
+    /// We need to know the size of the window.
+    void initialize(int width, int height);
+
+    /// Returns a canvas to draw into; NULL if not yet initialize()d.
+    SkCanvas* prepareToDraw();
+
+    /// Flushes all drawing commands to HWUI; no-op if not yet initialize()d.
+    void finishDrawing();
+
+    /// Blocks until HWUI has processed all pending drawing commands;
+    /// no-op if not yet initialize()d.
+    void fence();
+
+    /// Returns false if not yet initialize()d.
+    bool capturePixels(SkBitmap* bmp);
+
+private:
+    /// Hidden implementation.
+    class TestWindowData;
+
+    TestWindowData* mData;
+
+};
+
+}  // namespace uirenderer
+}  // namespace android
+
+#endif  // TESTWINDOWCONTEXT_H_
+