Add gin/gin.gyp:gin_shell into chromium_builder_dbg_drmemory_win build target

Add gin/gin.gyp:gin_shell into chromium_builder_dbg_drmemory_win build target
for running gin_unittests GinShellTest.HelloWorld on Dr.Memory bots.

NOTRY=true
TBR=hansmuller@chromium.org
BUG=398549
TEST=manual

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=286933

[zhaoqin, 2014-08-01 01:28:07]

The CQ bit was checked by zhaoqin@google.com

[commit-bot: I haz the power, 2014-08-01 01:30:05]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/zhaoqin@google.com/424463004/1

[commit-bot: I haz the power, 2014-08-01 01:33:00]

Change committed as 286933

[hansmuller, 2014-08-01 17:19:03]

On 2014/07/31 18:47:13, zhaoqin wrote:

LGTM (the big move has me somewhat disconnected).

I think gin/shell/gin_shell_unittest.cc should check that the gin_shell and
hello_world.js paths exist before launching the former and loading the latter.
If this sort of failure were to crop up again, that would make the failure
symptoms relatively straightforward to interpret.

I can do that next week, when we're back in business.