Get angle_implementation_unit_tests compiling on non-Windows platforms

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As part of the multi-platform ANGLE effort, the angle_implementation_unit_test 
files should be compiled on non-Windows platforms. Doing so will require 
libANGLE to be compiled as a necessary dependency, and expose more platform 
dependencies.

Original issue reported on code.google.com by kbr@chromium.org on 6 Oct 2014 at 11:04

• Blocking: #852
• Blocked on: #774

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Original comment by kbr@chromium.org on 7 Oct 2014 at 1:59

• Now blocked on: #774

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Stealing!

Original comment by jmad...@chromium.org on 2 Dec 2014 at 10:14

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Linux is good to go with https://chromium-review.googlesource.com/#/c/233441/. 
Next up is OSX.

Original comment by jmad...@chromium.org on 5 Dec 2014 at 8:49

• Changed state: Started

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Original comment by shannonw...@chromium.org on 6 Jan 2015 at 5:27

• Now blocking: #852

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Project: angle/angle
Branch : master
Author : Jamie Madill <jmadill@chromium.org>
Commit : fd67b1bfbdf1ab044e6ba6d87fff89808442ae62

Code-Review  0 : Jamie Madill
Code-Review  +1: Kenneth Russell
Code-Review  +2: Geoff Lang
Verified     0 : Geoff Lang, Kenneth Russell
Verified     +1: Jamie Madill
Commit Queue   : Chumped
Change-Id      : I6b88a85c62a2e07734ae81fb8276c28c5f8f9f47
Reviewed-at    : https://chromium-review.googlesource.com/258300

Move implementation unit tests to angle_unittests.

Now that libANGLE is cross-platform, this should work on OSX/Linux
and Android. Includes a warning fixes for test comparisons, and fix
to our META_ASSERT wrapper macro for clang.

BUG=angleproject:773

src/common/debug.h
src/libANGLE/Fence.h
src/libGLESv2/entry_points_gles_2_0_ext.cpp
tests/angle_end2end_tests.gypi
tests/angle_implementation_unit_tests/Config_unittest.cpp
tests/angle_implementation_unit_tests/Fence_unittest.cpp
tests/angle_unittests.gypi

Original comment by bugdro...@chromium.org on 11 Mar 2015 at 3:08