Adding GCM support to the copresence component.

components/copresence.gypi

Index: components/copresence.gypi
diff --git a/components/copresence.gypi b/components/copresence.gypi
index cf5c10e70782b594c8fc87bed35d8c549d0ae298..1a789cefdce8579602a90c833569365233222961 100644
--- a/components/copresence.gypi
+++ b/components/copresence.gypi
@@ -33,6 +33,8 @@
         'copresence/handlers/audio/tick_clock_ref_counted.h',
         'copresence/handlers/directive_handler.cc',
         'copresence/handlers/directive_handler.h',
+        'copresence/handlers/gcm_handler.cc',
+        'copresence/handlers/gcm_handler.h',
         'copresence/mediums/audio/audio_manager.h',
         'copresence/mediums/audio/audio_manager_impl.cc',
         'copresence/mediums/audio/audio_manager_impl.h',
@@ -59,15 +61,23 @@
     {
       'target_name': 'copresence_test_support',
       'type': 'static_library',
+      'dependencies': [
+        'copresence_proto',
+      ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'copresence/test/audio_test_support.cc',
         'copresence/test/audio_test_support.h',
+        'copresence/test/fake_directive_handler.cc',
+        'copresence/test/fake_directive_handler.h',
         'copresence/test/stub_whispernet_client.cc',
         'copresence/test/stub_whispernet_client.h',
       ],
+      'export_dependent_settings': [
+        'copresence_proto',
+      ],
     },
     {
       # Protobuf compiler / generate rule for copresence.
@@ -82,6 +92,7 @@
         'copresence/proto/data.proto',
         'copresence/proto/enums.proto',
         'copresence/proto/identity.proto',
+        'copresence/proto/push_message.proto',
         'copresence/proto/rpcs.proto',
       ],
       'variables': {