Add GYP target for WebRTC Video demo for Android.

Add a build target for the Video demo app for Android that only
exists when OS=='android' during build.

Note that this doesn't solve webrtc:1029, it's more like a workaround
waiting for the complete solution, which is to great a proper GYP target
that doesn't involve an action and an external script.

BUG=1029
TEST=Built successfully with:
source build/android/envsetup.sh
gclient runhooks
ninja -C out/Debug
Also verified the target is not present when OS is not 'android'.

Review URL: https://webrtc-codereview.appspot.com/1286004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3769 4adac7df-926f-26a2-2b94-8c16560cd09d

.gitignore

@@ -67,6 +67,8 @@
 /third_party/yasm
 /third_party/WebKit/Tools/Scripts
 /tools/clang
+/tools/grit
+/tools/gritsettings
 /tools/gyp
 /tools/python
 /tools/valgrind

webrtc/video_engine/test/android/android_video_demo.gypi

@@ -0,0 +1,33 @@
+# Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+{
+  'targets': [
+    {
+      'target_name': 'video_demo_apk',
+      'type': 'none',
+      'dependencies': [
+        '<(webrtc_root)/modules/modules.gyp:*',
+        '<(webrtc_root)/test/channel_transport.gyp:channel_transport',
+        '<(webrtc_root)/video_engine/video_engine.gyp:video_engine_core',
+        '<(webrtc_root)/voice_engine/voice_engine.gyp:voice_engine_core',
+      ],
+      'actions': [
+        {
+          # TODO(leozwang): Convert building of the demo to a proper GYP target
+          # so this action and the custom build script is not needed.
+          'action_name': 'build_video_demo_apk',
+          'inputs' : [],
+          'outputs': ['<(webrtc_root)'],
+          'action': ['python',
+                     '<(webrtc_root)/video_engine/test/android/build_demo.py'],
+        },
+      ],
+    },
+  ],
+}
+

webrtc/video_engine/video_engine.gyp

@@ -18,6 +18,13 @@
         'test/libvietest/libvietest.gypi',
         'test/auto_test/vie_auto_test.gypi',
       ],
+      'conditions': [
+        ['OS=="android"', {
+          'includes': [
+            'test/android/android_video_demo.gypi',
+          ],
+        }],
+      ],
     }],
   ],
 }