[EFL] Add matrix list to reuse tile matrix for each different zoom level.

[EFL] Add matrix list to reuse tile matrix for each different zoom level.
https://bugs.webkit.org/show_bug.cgi?id=68595

Patch by KwangHyuk Kim <hyuki.kim@samsung.com> on 2011-11-17
Reviewed by Kenneth Rohde Christiansen.

Add matrix list to keep each tile matrix corresponding to each different zoom level when zoom level is changed.
Then backing store can reuse tile matrix by getting it from this matrix list.

* ewk/ewk_tiled_backing_store.cpp:
(_ewk_tiled_backing_store_model_matrix_create):
(_ewk_tiled_backing_store_smart_calculate):
(_ewk_tiled_backing_store_zoom_set_internal):
* ewk/ewk_tiled_matrix.cpp:
(ewk_tile_matrix_entry_get):
(_ewk_tile_matrix_cell_free):
(_ewk_tile_matrix_tile_free):
(ewk_tile_matrix_new):
(ewk_tile_matrix_zoom_level_set):
(ewk_tile_matrix_invalidate):
(ewk_tile_matrix_free):
(ewk_tile_matrix_tile_new):
* ewk/ewk_tiled_matrix.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@100724 268f45cc-cd09-0410-ab3c-d52691b4dbfc