Initial escalator commit (#12645)

Change-Id: Ibd0ac2896e12b99ddebdc26674a2dfced486c49a
Implement escalator pattern for widget (#12645)

Change-Id: Ibdc5a5162ae88e886e74d93f3f75f4ea3c6dab89
Add scrollToRow/Column, also some final declarations (#12645)

Change-Id: I4142edff9bc078c35ee70643fc3368bec10003f9
Fixes insert/remove columns and testcase (#12645)

This includes also other bugs that were found while creating a more suitable testcase for this

Change-Id: I841e3643550b02d1ba16d2eee74deab9be15cc26
Convert CellRenderer to revised EscalatorUpdater (#12645)

Change-Id: I046c53e775cdeaf4cfb02c47b3f2ca35231e4045
Add column freezing to Escalator (#3087)

Change-Id: I9943b20ca2568c353c90dec598534fbb5ab58203
Base grid component and column API (#12829, #12830)

Change-Id: I6c4eae8a4369e9452dd56e764633cecfe9bf553a
Implement touch-based scrolling for Escalator (#12645)

Change-Id: I74559572412a26823903cdc0e0f171ec55c21ee7
Merge branch 'master' into grid

Change-Id: I9f669ec38c39a42d1ef2a25121b77aab31551863
Fixes Escalator resize issues (#12645)

Change-Id: I34273d35338568833b179b61294de7462abe78f1
Support OSX's hiding scrollbars (#12645)

Change-Id: If5df6a7651482a33558088398330fd73a4d43645
Multiple headers and footer rows #3153

Change-Id: Iadb0d8b051d0f0ef1303e0d7d740cf476cd81971
Introduce initial data source support for Grid (#12878)

Change-Id: I2d1b2e4a797b2dac9ee97c832fcd40fb472edc08
Unify empty ranges to always have a defined position (#12645)

Change-Id: Iaeef125159df878d3b49b1a588c19b5d1b479b76
Add server-side API for column freezing (#3087)

Change-Id: I4704ab2bd2b1af31b4586e26cf89f03d97f136a4
Added JUnit tests for column groups #3153

Change-Id: I49c6fb59454a0aba3d2399c40a9b6b8c00667a71
Testbench tests for Column api #12830

Change-Id: Icb07f2540db2299de95873e4062eb680d6ab5bd2
Fixes a bug with frozen columns, and adding/removing them (#12645)

Change-Id: I7b085d1113c4f21c5b494dde97c45d728e0ea4a0
Fixed bug where deleting column caused an exception #12830

Change-Id: Ia44b11783d9822a6b91ecd0fe7fc0547e7fd4668
Add support for colspan in Escalator (#12645)

Change-Id: I252fe949537154bce7e09d42f434bce20ec28928