Don't track TextureLayer lifecycles in RenderState

bug:17208461

They are destroyed via finalizer-enqueued destroy method, so it's not
valid to check that they've been destroyed at gl context destruction
time.

Change-Id: I670f69825547facd5f31d44acb406418881fee00
diff --git a/libs/hwui/LayerRenderer.cpp b/libs/hwui/LayerRenderer.cpp
index e3b0daf..103c843 100644
--- a/libs/hwui/LayerRenderer.cpp
+++ b/libs/hwui/LayerRenderer.cpp
@@ -272,9 +272,8 @@
 Layer* LayerRenderer::createTextureLayer(RenderState& renderState) {
     LAYER_RENDERER_LOGD("Creating new texture layer");
 
-    Layer* layer = new Layer(renderState, 0, 0);
+    Layer* layer = new Layer(Layer::kType_Texture, renderState, 0, 0);
     layer->setCacheable(false);
-    layer->setTextureLayer(true);
     layer->setEmpty(true);
     layer->setFbo(0);
     layer->setAlpha(255, SkXfermode::kSrcOver_Mode);