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This allows doing things like TEST_P(TestFixture, MAYBE(TestName))
for nicer conditional test disabling.

Upstream of cr/188748737.

Tested:
Added unit tests MacroNamingTest and MacroNamingTestNonParametrized.

Check whether _MSC_VER is defined when detecting presence of cxxabi.h…

Many code merge/upstream changes

 merges, cl/155419551 and others

more code merge

code merge

code merge

Added support for WINAPI_PARTITION_TV_TITLE to support XboxOne applications

Adding python tests to Bazel build file.

Adding python tests to Bazel build file. 

Expose ScopedTrace utility in public interface

If _MSC_VER is defined, it means that we are using the Microsoft
ABI, so cxxabi.h (which is associated with the Itanium ABI) will not
be available.

Code merging

Fix double free when building Gtest/GMock in shared libraries and lin…