GDB support for Android in devtools' debugger.

README.md

 Mojo
 ====
 
 Mojo is an effort to extract a common platform out of Chrome's renderer and
 plugin processes that can support multiple types of sandboxed content, such as
 HTML, Pepper, or NaCl.
 
 ## Set-up and code check-out
 
 The instructions below only need to be done once. Note that a simple "git clone"
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 #### Android crash stacks
 When Mojo shell crashes on Android ("Unfortunately, Mojo shell has stopped.")
 due to a crash in native code, `debugger` can be used to find and symbolize the
 stack trace present in the device log:
 
 ```
 mojo/devtools/common/debugger device stack
 ```
 
+#### GDB
+It is possible to inspect a Mojo Shell process using GDB. The `debugger` script
+can be used to launch GDB and attach it to a running shell process (android
+only):
+```
+mojo/devtools/common/debugger gdb attach
+```
+
 ### Android set-up
 
 #### Adb
 
 For the Android tooling to work, you will need to have `adb` in your PATH. For
 that, you can either run:
 ```
 source build/android/envsetup.sh
 ```
 
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 ```
 adb logcat | ./tools/android_stack_parser/stack
 ```
 
 ### Running manually on Linux
 
 If you wish to, you can also run the Linux Mojo shell directly with no wrappers:
 ```
 ./out/Debug/mojo_shell mojo:spinning_cube
 ```