To add perftests and reuse some utility classes, reconstruct
test directory structure.

- Move unit tests from minikin/tests to minikin/tests/unittests
- Extract utilitiy classes to minikin/tests/utils which will be
  used by perftests eventually.

Change-Id: I5026b177934e72ae67d362ee888302037da2f808

am: b11b991f

* commit 'b11b991f':

Change-Id: I0a3d24fcffb1d0533970058b4a3498d45e794f36

am: b4bbae32

* commit 'b4bbae32':
  Do not break after Myanmar viramas

Change-Id: I69972aed4fe1c1b956c0b65af18e1a4f1c739bf4

am: 8614b042

* commit '8614b042':

Change-Id: I4437e1206de2a45593e69956d8bcdf85a64b0f32

am: 00de2cc3

* commit '00de2cc3':
  Do not break after Myanmar viramas

Change-Id: I2e240fab84a49c73165056ee5ff18dbfca0faeec

am: 74b56175

* commit '74b56175':
  Do not break after Myanmar viramas

Change-Id: Idb9303889ac87853a730cdb25fba7faaaf352b93

am: 74b56175

* commit '74b56175':
  Do not break after Myanmar viramas

Change-Id: I13297120c3c3789c03b860c9e72b3a04922ab9fa

This is to work around a bug in ICU's line breaker, which thinks
there is a valid line break between a Myanmar kinzi and a consonant.
See http://bugs.icu-project.org/trac/ticket/12561 for the ICU bug.

Bug: 28964845
Change-Id: I076ac15077e5627cbccf6732900bcc60d8596dda

am: bf94219d

* commit 'bf94219d':

Change-Id: I022dd9f9f800851fc7941dcdc4ebd0a9aca0f0bf

am: 8010ad47

* commit '8010ad47':
  Do not break before and after ZWJ.

Change-Id: I5cdc475d6b525aac29b8433e675d2ad2feb68722

am: f9783b13

* commit 'f9783b13':

Change-Id: I5a637871133d3e45c47c5b6dc8407bda946dbd62

am: 3bee494e

* commit '3bee494e':
  Do not break before and after ZWJ.

Change-Id: If1fe6c6192aae09bab68a00bc94aba3e768dd445

am: 77f48834

* commit '77f48834':
  Do not break before and after ZWJ.

Change-Id: Ic476d9048b44b84c69fd185b76108c961d8e8545

am: 77f48834

* commit '77f48834':
  Do not break before and after ZWJ.

Change-Id: I00a0e31c19dd5b2fbe2ffb389bec4001dec5d6c1

The emoji list is generated from external/unicode/emoji-data.txt

Bug: 28248662
Change-Id: Ie49b3782505665d62c24371ca23d317ae5e9c5f7

am: 34c784e5

* commit '34c784e5':
  Returns hasVariationSelector true for VS15/VS16

Change-Id: I14b0971a3ff50572e594a0814a26e10113fe7c1c

am: 994aa84f

* commit '994aa84f':
  Returns hasVariationSelector true for VS15/VS16

Change-Id: Iff3953948c8457e2a85e5859559411511a326f33

Minikin has a special font fallback for VS15/VS16, so
hasVariationSelector for emojis with VS15/VS16 should always return
true.

Bug: 27531970
Change-Id: Ieebd58f48b135b6ec50d999df68dcc09b1284606

am: 4d42baff

* commit '4d42baff':
  Clear mLineWidths in LineBreaker::finish()

Change-Id: I59606b706f78eda015da28f0ce6201b445086cbe

am: b1203b64

* commit 'b1203b64':
  Clear mLineWidths in LineBreaker::finish()

Change-Id: I968a1584b9f2d2242725b8ab7047091ca9ecd6ee

There was the possibility of stale indents from previous invocations
persisting in the mLineWidths across multiple invocations. This patch
clears them.

Bug: 28090810
Change-Id: I3621dfbe983512046289373711709aeade52eab4

am: af36413c

* commit 'af36413c':
  Fix minikin_unittests

Change-Id: Ibac5c54ae165d96811238a4e8d2e9612d1192eaf

am: 6c60831c

* commit '6c60831c':
  Fix minikin_unittests

Change-Id: I865dd495ed60b0bbace0ba77b2071dac058887e9

This CL fixes following test cases in minikin_tests
- FontFamilyTest.hasVariationSelectorTest
- HbFontCacheTest.getHbFontLockedTest
- HbFontCacheTest.purgeCacheTest

For the fix of FontFamilyTest.hasVariationSelectorTest, removing virtual
from GetUniqueId() in MinikinFont.  After [1], MinikinFont's destructor
started calling purgeHbCache() which calls virtual method,
MinikinFont::GetUniqueId().  Fortunately, the SkTypeface::uniqueID()
returns just internal value, so we can store it at the construction time
and use it instead of calling SkTypeface::uniqueID() every time.

This patch also changes purgeHbFont to purgeHbFontLocked, as all uses of
it were already under global mutex. This change avoids deadlock on
explicit unref, as when invoked by a Java finalizer from the Java object
that holds a reference to the font.

Some of the tests needed to change to using the ref counting protocol
rather than explicitly destructing font objects, as well.

[1] 9afcc6e2

Bug: 28105730
Bug: 28105688
Change-Id: Ie5983c4869147dacabdca81af1605066cd680b3f

am: bfc161d8

* commit 'bfc161d8':
  Update minikin/sample code to use new GetTable

Change-Id: Idd6063401cdb1399bac52c975a32a0a0b221652f

am: 29abb821

* commit '29abb821':
  Update minikin/sample code to use new GetTable

Change-Id: I5fcae79c42322dcc0533dbd3eb1a51007e089170

We changed the signature of the MinikinFont::GetTable method. This
patch updates the sample code, and fixes the build.

Change-Id: I1977be868bf7636986fc802915f3dd54c418a73a

am: 0b5d3b2b

* commit '0b5d3b2b':
  Avoid copying of font table data

Change-Id: Ie1e0be38e1875702414b7ca005c5837bd60b82d8

am: aaa4e347

* commit 'aaa4e347':
  Avoid copying of font table data

Change-Id: Idc4074ebf93595fa0420986814462095730f00c2

The hb_font_t object holds on to tables of font data, acquired through
the MinikinFont::GetTable interface, which is based on copying data
into caller-owned buffers. Now that we're caching lots of hb_font_t's,
the cost of these buffers is significant.

This patch moves to a different interface, inspired by HarfBuzz's
hb_reference_table API, where the font can provide a pointer to the
actual font data (which will often be mmap'ed, so it doesn't even
consume physical RAM).

Bug: 27860101
Change-Id: Id766ab16a8d342bf7322a90e076e801271d527d4

am: aa495426

* commit 'aa495426':
  Purge hb font on Minikin font destruction

Change-Id: If40c31c90bf4f12fdd882be4f2c6f9b35ba2d09c

am: 9afcc6e2

* commit '9afcc6e2':
  Purge hb font on Minikin font destruction

Change-Id: Idb2034353407e8b390cc07862803f846d5adea0c

This patch eagerly purges the corresponding hb_font_t object from
the HbFontCache when the underlying MinikinFont is destroyed. After
that, the key will no longer be accessed, so having the entry is
wastes memory.

Bug: 27251075
Bug: 27860101
Change-Id: I1b98016133fe3baf6525ac37d970a65ddccadb4f

am: 5f7df3ec

* commit '5f7df3ec':
  Support multiple locales for font language settings.

Change-Id: I27df2a2d6de262599931a16a9a65030149ee8991

am: f3afe92d

* commit 'f3afe92d':
  Support multiple locales for font language settings.

Change-Id: Iad60bf1c01f309e70c3b1ad22e28b22afe44b33f

Some fonts support multiple scripts, for example, some fonts for
Korean supports not only "Kore" but also "Jamo".

To select fonts based on their multiple languages, this CL introduces
the following changes:
- Compares all languages of the font family and use the maximum score
  for font selection.
- Even if each language of the font family doesn't support the requested
  language, the font get score of 2 if the requested font is covered by
  all of the languages of the font family. For example, the font for
  "ko-Hang,ko-Hani" gets score of 2 for the requested language "ko-Kore".

Bug: 26687969

Change-Id: I7f13b51464c9b01982bb573251d77052b9ddbd70

am: 85593542

* commit '85593542':
  Try putting combining marks in the same font run

Change-Id: If298c6d45b48928c7a93ac4866272f78b2f0aedd

am: 16ed4ef0

* commit '16ed4ef0':
  Try putting combining marks in the same font run

Change-Id: I6f76b791acde2dc8209e8d33da02d148a9f790d8

Indic combining marks, when combined with a common character such as
a hyphen or a dotted circle, used to get rendered in a different font
due to the greedy algorithm used in determining runs, which resulted
in the base character and the combining mark getting rendered in
separate font runs, resulting in a dotted circle appearing in phrases
such as "100-ാം" (0031 0030 0030 002D 0D3E 0D02).

This change makes combining marks change the font run of the base
character if the base character is supported in the same font as the
combining mark, similar to the support for emoji modifiers and the
combining keycap.

Bug: 25036888
Bug: 24535344
Change-Id: I8e2798e8ecb8efaf723a0fd02c05c6fbdef8b365