Remove ICS and Holo themes. Remove most png keyboard resources, replacing with xml shapes and colors

Out of the box, we want Alt-Left to toggle Emojis, while Alt-Right
toggles the shifted symbols layout.

Bug: 23954008
Bug: 24369173

Change-Id: I93dd66fb469e5d0a831359ff3a786fe68e1d73ea
(cherry picked from commit 411841b374aa04e333ea5a438dfd539f49ec589a)

This CL also removes unused key preview resources for Tablet.

Bug: 15143928
Change-Id: Icbf4f7b6d5c7839b4fe7a27d320a2184f0625130

The height of Google Keyboard is limited by maximum and minimum ratio
to the display height.  Because screen aspect ratio of some large
tablet is close to 1:1, the height of the keyboard may become taller
than expected. This CL lowers the minimum ratio to allow shorter
height. This CL also increase text size of Material theme keyboard on
tablet as well.

Bug: 17050390
Change-Id: I87c5f49ce554950c525a1f31dfddfd1beb3fafda

This reverts commit 5ad718f2.

This reverts commit 44e20f4f.

Change-Id: I6560c8f4ef15bf8318d9eedf68a9eb5031f0581d

Bug: 14419121
Change-Id: I6a477b9bf9022e369d4a6a77415490dc2b9eefc6

This reverts commit cdcaa37a.

Due to unit test breakage.

Change-Id: I1c22edf983f6e03a34b86d7c1fae3d3188447a75

This CL removes the following unused Key attributes
- Key.keyLabelFlags' followKeyLargeLabelRatio
- Keyboard.keyLargeLabelRatio

Change-Id: Ib4fb13cc7ca902ac1733ecf27bd284d07e10bc3e

This reverts commit 44454c2b.

Due to unit test breakage.

Bug: 14419121
Change-Id: Id0bbc2276fc035aa090f7bb4fa8112a1aecd483f

Change-Id: Iae3cd6674448f258ee0a4bf2966bf3c347876b4f

Change-Id: I065824f3fab941560980d3d9387730e4c25eb12b

Bug: 14419121
Change-Id: I3b2bdc3c07bb7e49ea7be53649bd6dd134fea27c

This CL also tunes the width of suggestions strip to be able to
display 15~16 letters without x-scaling at the center slot.

Bug: 14419121
Change-Id: Ia5766cee043899533e24e2ebc621e8dc279370b3

This CL must be checked in together with I6a9ac172a5.

Bug: 14042743
Change-Id: Ic3f01f5d10097d743325df847bd7cd2959992487

This is a cherry-pick of I668b55a514.

Change-Id: I00e9a74812d622c12af0337ba50e1b2f1d675cf1

The bulk merge from -bayo to klp-dev should not have been merged to master.

Change-Id: I527a03a76f5247e4939a672f27c314dc11cbb854

Change-Id: I668b55a51414a3e69d4e2197d7ffeecbd4f18819

Change-Id: Ia16880e818927bc3df7292e130b2f7b5efc9776e

This is a followup of I6fb11b8cb5.

Change-Id: I2a78affabf278e13fdeb2d4fcb0e5d26fb748a8b

Change-Id: I6fb11b8cb52c06b805fb17d61450d7df50e4e20d

Change-Id: Ib5b1a72313e1358f6bb4051e693f889833548e3c

Change-Id: If65e19725da941fd36d566cdcf3bc9c343c04cbb

Bug: 11955386
Change-Id: Id8896acaa2c82d68fad59628d12e229c9d86c17e

Change-Id: I0112eb55798a36c8e3c6ed6f7363345724c1935d

Change-Id: Ie0fdf019373557b3f5cc4d93159d10e4092edaa3

Change-Id: I455ef79862a0e5f7c6a4c4095d0f1ee3d632a7f6

Bug: 11622614
Change-Id: I25aa1ff7376fe72fd94ab2cb7190c61d7a98a1af

Bug: 11622614
Change-Id: I126fc42dd31e912788db0446b67a9d4ea80f848e

Bug: 11518021
Change-Id: I139b18708055e0811234886578c5a30b8cc71fec

Bug: 11737015
Change-Id: I39f7ca13b99f019a2edb5aa690e3142ceba4e837

Bug: 11622614
Change-Id: I25aa1ff7376fe72fd94ab2cb7190c61d7a98a1af

Bug: 11622614
Change-Id: I126fc42dd31e912788db0446b67a9d4ea80f848e

Change-Id: I5f85a7a0f94ea9ecbe0c4a8caebcf551fa9c9669

Bug: 10415342
Change-Id: I9073c54b037e0f7973710a9e24ca5044f8db6db0

Bug: 8556975
Change-Id: If7839c5764f7a269243a9570c0b7782b6f7ee73b

Try reducing some confusions between GesturePreviewTrail.java and GestureTrailsPreview.java

Change-Id: I5fe2ee740cf1b32210530188153f6f6937e34b68