https://sites.google.com/a/chromium.org/dev/developers/how-tos/-quickly-building-for-cros-arm-x64
Due to the lack of ARM hardware with the grunt to build Chromium native, cross compiling is currently the recommended method of building for ARM.
These instruction are designed to run on Ubuntu Precise.
The install-build-deps script can be used to install all the compiler and library dependencies directly from Ubuntu:
$ ./build/install-build-deps.sh
A prebuilt sysroot image is kept up to date on Cloud Storage. It will automatically be installed by gclient runhooks installed if you have target_arch=arm in your GYP_DEFINES.
To install the sysroot manually you can run:
./build/linux/sysroot_scripts/install-sysroot.py --arch=arm
To build for ARM, using the clang binary in the chrome tree, use the following gn args:
target_cpu = "arm"
Chromium's testing infrastructure for ARM/Linux is somewhat limited. There are currently two builders setup, one on the FYI waterfall and one the the try bot waterfall:
These bots run x86-64 linux and cross-compile the ARM targets. Tests are run on ARM hardware via swarming.
If you don't have a real ARM machine, you can test with QEMU. For instance, there are some prebuilt QEMU Debian images here: http://people.debian.org/~aurel32/qemu/. Another option is to use the rootfs generated by rootstock, as mentioned above.
Here's a minimal xorg.conf if needed:
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "fbdev"
Option "UseFBDev" "true"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 8
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
'arm_thumb': 1