how to assign a specific version tool chain to cross compile the chromium?

[Damon chen]

HI ALL:

I have cross compiled the chromium for arm-linux,  but I didnt assign my toolchain(which the toolchain used for my board).  it use the default toolchain which install to the host OS: 

sudo apt-get install gcc-arm-linux-gnueabihf.

So , my question is how to assign my own tool chain to cross compile the chromium?