Revert of Sketch splitting SkPicture into an interface and SkBigPicture.

src/core/SkLayerInfo.cpp

Index: src/core/SkLayerInfo.cpp
diff --git a/src/core/SkLayerInfo.cpp b/src/core/SkLayerInfo.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d427fa7c2188621b2e3d82b2dba4cbfb82397617
--- /dev/null
+++ b/src/core/SkLayerInfo.cpp
@@ -0,0 +1,15 @@
+/*
+ * 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 "SkLayerInfo.h"
+
+SkPicture::AccelData::Key SkLayerInfo::ComputeKey() {
+    static const SkPicture::AccelData::Key gGPUID = SkPicture::AccelData::GenerateDomain();
+
+    return gGPUID;
+}
+