Bug 865902 - Port old gfx unit tests. r=milan

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rename : gfx/tests/TestColorNames.cpp => gfx/tests/gtest/TestColorNames.cpp
rename : gfx/tests/TestRect.cpp => gfx/tests/gtest/TestRect.cpp
rename : gfx/tests/TestRegion.cpp => gfx/tests/gtest/TestRegion.cpp
rename : gfx/tests/gfxFontSelectionTest.cpp => gfx/tests/gtest/gfxFontSelectionTest.cpp
rename : gfx/tests/gfxFontSelectionTests.h => gfx/tests/gtest/gfxFontSelectionTests.h
rename : gfx/tests/gfxSurfaceRefCountTest.cpp => gfx/tests/gtest/gfxSurfaceRefCountTest.cpp
rename : gfx/tests/gfxTextRunPerfTest.cpp => gfx/tests/gtest/gfxTextRunPerfTest.cpp
rename : gfx/tests/gfxWordCacheTest.cpp => gfx/tests/gtest/gfxWordCacheTest.cpp
rename : gfx/tests/per-word-runs.h => gfx/tests/gtest/per-word-runs.h