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/font/CacheTexture.cpp b/libs/hwui/font/CacheTexture.cpp
index 2d58338..5f15724 100644
--- a/libs/hwui/font/CacheTexture.cpp
+++ b/libs/hwui/font/CacheTexture.cpp
@@ -156,7 +156,7 @@
         mTexture = NULL;
     }
     if (mTextureId) {
-        glDeleteTextures(1, &mTextureId);
+        mCaches.deleteTexture(mTextureId);
         mTextureId = 0;
     }
     mDirty = false;