Implement the skeleton of an android content shell.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 7001af375add9c5f958d4b57d650d571718fec8a..f853956e88b2ba326b2571267748c91a47c3fb5a 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2422,9 +2422,16 @@
                   '<(android_ndk_lib)/crtend_android.o',
                 ],
               }],
-              ['_type=="shared_library"', {
+              ['_type=="shared_library" or _type=="loadable_module"', {

[John Grabowski, 2012/04/19 18:55:27]

Can you briefly tell me why we're using loadable_module instead of
shared_library somewhere?  I don't think it's wrong but don't quite under the
distinction in the gyp sense.

[Ted C, 2012/04/19 23:21:07]

This was taken from downstream to make skia happy during linking.  I'm not
currently using the loadable_module portion, so I will remove it.

I did need to remove the flag you just added though -nostdlib

As it was causing errors for:
multiple definition of '__dso_handle'
multiple definition of '__INIT_ARRAY__'
multiple definition of '__FINI_ARRAY__'

                 'ldflags': [
                   '-Wl,-shared,-Bsymbolic',
+                  # crtbegin_so.o should be the last item in ldflags.
+                  '<(android_ndk_lib)/crtbegin_so.o',
+                ],
+                'libraries': [
+                  # crtend_so.o needs to be the last item in libraries.
+                  # Do not add any libraries after this!
+                  '<(android_ndk_lib)/crtend_so.o',
                 ],
               }],
             ],