Add java_cpp_template template

Add java_cpp_template template

This is the GN version of build/java_cpp_template.gypi.

It defines a template that wraps an action_foreach that generates .java
files using the host C preprocessor.

The major difference in the GN version is that it takes all the
generated java files and zips them together in a single .srcjar. When
such a target is included in the srcjar_deps of a java library, the
.java files in the .srcjar will be treated much like files listed in
that libraries java_sources (particularly they will be compiled and
included in the .jar/.dex).

Depends on https://crrev.com/264773014/

BUG=359249
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272775

[cjhopman, 2014-05-05 20:48:59]

brettw: *

[brettw, 2014-05-06 18:06:35]

lgtm

https://codereview.chromium.org/264923007/diff/40001/base/BUILD.gn
File base/BUILD.gn (right):

https://codereview.chromium.org/264923007/diff/40001/base/BUILD.gn#newcode941
base/BUILD.gn:941: ]
out-dent ] by 2 spaces (same below)

https://codereview.chromium.org/264923007/diff/40001/build/config/android/rul...
File build/config/android/rules.gni (right):

https://codereview.chromium.org/264923007/diff/40001/build/config/android/rul...
build/config/android/rules.gni:106: base_gen_dir =
"${root_gen_dir}/java_cpp_template/${target_name}/${package_name}"
Can you put the string on the next line to make it 80 cols?

https://codereview.chromium.org/264923007/diff/40001/build/config/android/rul...
build/config/android/rules.gni:111: )
) goes on prev line.

[cjhopman, 2014-05-22 00:06:19]

The CQ bit was checked by cjhopman@chromium.org

[commit-bot: I haz the power, 2014-05-22 00:07:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cjhopman@chromium.org/264923007/100001

[commit-bot: I haz the power, 2014-05-22 06:34:34]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  ios_rel_device_ninja on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_rel_device_ninja/...)

[commit-bot: I haz the power, 2014-05-22 09:32:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-22 09:32:36]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[cjhopman, 2014-05-25 23:18:00]

The CQ bit was checked by cjhopman@chromium.org

[commit-bot: I haz the power, 2014-05-25 23:18:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cjhopman@chromium.org/264923007/120001

[commit-bot: I haz the power, 2014-05-26 04:01:52]

Change committed as 272775