Run CanvasState test across a library boundary.

tests/CanvasStateHelpers.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTypes.h"
+
+class SkCanvas;
+class SkCanvasState;
+class SkPaint;
+class SkRegion; // for now...
+
+/*
+ *  Helper function to perform drawing to an SkCanvas. Used by both
+ *  test_complex_layers and complex_layers_draw_from_canvas_state.
+ */
+void complex_layers_draw(SkCanvas* canvas, float left, float top,
+                         float right, float bottom, int32_t spacer);
+
+/*
+ *  Create an SkCanvas from state and draw to it. Return true on success.
+ *  Used by test_complex_layers test in CanvasStateTest. Marked as extern
+ *  so it can be called from a separate library.
+ */
+extern "C" bool complex_layers_draw_from_canvas_state(SkCanvasState* state,
+        float left, float top, float right, float bottom, int32_t spacer);
+
+void test_complex_clips_draw(SkCanvas* canvas, int32_t left, int32_t top,
+        int32_t right, int32_t bottom, int32_t clipOp, const SkRegion& localRegion);
+
+// FIXME: Don't use SkRegion...
+extern "C" bool test_complex_clips_draw_from_canvas_state(SkCanvasState* state, int32_t left,
+        int32_t top, int32_t right, int32_t bottom, int32_t clipOp, const SkRegion* localRegion);