Merge "Add more documentation for Android Clang/LLVM toolchain." am: 4ed5845
am: 38ec2ba

* commit '38ec2ba99e5a9ba3dfaf89ee239aa8617a6f9b99':
  Add more documentation for Android Clang/LLVM toolchain.

Change-Id: I2200944f43f094c4f33a0bcfd34349cfebd7c916