Assume a texture is unbound after deleting it
Bug #9316260

The GL specification indicates that deleting a bound texture has
the side effect of binding the default texture (name=0). This change
replaces all calls to glDeleteTextures() by Caches::deleteTexture()
to properly keep track of texture bindings.

Change-Id: Ifbc60ef433e0f9776a668dd5bd5f0adbc65a77a0
diff --git a/libs/hwui/TextureCache.cpp b/libs/hwui/TextureCache.cpp
index 7f5b80f..a63cac6 100644
--- a/libs/hwui/TextureCache.cpp
+++ b/libs/hwui/TextureCache.cpp
@@ -112,7 +112,7 @@
         if (mDebugEnabled) {
             ALOGD("Texture deleted, size = %d", texture->bitmapSize);
         }
-        glDeleteTextures(1, &texture->id);
+        texture->deleteTexture();
         delete texture;
     }
 }