Android: factor out use of SDK jar.

Android: factor out use of SDK jar.

Specify the path to the Android SDK main jarfile in a single location so
that it can be overridden by the WebView build.

BUG=
TBR=fischman@chromium.org,brettw@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=188737

[Torne, 2013-03-18 14:18:35]

Hi Marcus,

It turns out that there *are* a few uses of the jar jni generator for things
other than the android jar, so I have instead created a separate gyp variable
for it. We can override this in envsetup for the webview build so it will serve
our purposes.

[Torne, 2013-03-18 14:32:50]

OK, turns out I was mistaken and the other uses of input_jar_file are actually
referring to jarjar.gypi and not the JNI generator, so it's okay to remove it
entirely where it's used for JNI generation.

[bulach, 2013-03-18 14:38:41]

lgtm, thanks!

[Torne, 2013-03-18 15:04:21]

We need to land this as a prerequisite for fixing the downstream android webview
build, so TBRing:

brettw: for content/content.gyp and webkit/glue/webkit_glue.gypi
fischman: for media/media.gyp

[Torne, 2013-03-18 15:05:17]

Committed patchset #2 manually as r188737 (presubmit successful).

[Ami GONE FROM CHROMIUM, 2013-03-18 15:48:44]

post-commit LGTM