Implement SkiaRecordingCanvas, RenderNodeDrawable and other drawables.

Implement SkiaRecordingCanvas, RenderNodeDrawable, GLFunctorDrawable,
LayerDrawable, StartReorderBarrierDrawable, EndReorderBarrierDrawable.
Move AnimatedRoundRect and AnimatedCircle in a separate file.
All Skia pipeline files are moved in hwui/pipeline/skia folder.
Add unit tests for RenderNodeDrawable, StartReorderBarrierDrawable,
EndReorderBarrierDrawable and SkiaRecordingCanvas.

Test: I tested manually on 6P devices and did run the unit tests.
Change-Id: If2a347bd1fc4689953822294ce5bf98c7f3f57c7
diff --git a/libs/hwui/pipeline/skia/SkiaFrameRenderer.h b/libs/hwui/pipeline/skia/SkiaFrameRenderer.h
new file mode 100644
index 0000000..70207c1
--- /dev/null
+++ b/libs/hwui/pipeline/skia/SkiaFrameRenderer.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#pragma once
+
+namespace android {
+namespace uirenderer {
+namespace skiapipeline {
+
+/**
+ * TODO: this is a stub that will be added in a subsquent CL
+ */
+class SkiaFrameRenderer {
+public:
+
+    static bool skpCaptureEnabled() { return false; }
+
+    // TODO avoids unused compile error but we need to pass this to the reorder drawables!
+    static float getLightRadius() {
+        return 1.0f;
+    }
+
+    static uint8_t getAmbientShadowAlpha() {
+        return 1;
+    }
+
+    static uint8_t getSpotShadowAlpha() {
+        return 1;
+    }
+
+    static Vector3 getLightCenter() {
+        Vector3 result;
+        result.x = result.y = result.z = 1.0f;
+        return result;
+    }
+
+};
+
+}; // namespace skiapipeline
+}; // namespace uirenderer
+}; // namespace android