Disable GCMConnectionHandlerImplTest.RecvMsg on Linux

TBR=dimich@chromium.org

Bug: 906093
Change-Id: Ica264f2a26dc52b1e44c12520b627a3032cbccf2
Reviewed-on: https://chromium-review.googlesource.com/c/1340779
Reviewed-by: Ella Ge <eirage@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608873}

google_apis/gcm/engine/connection_handler_impl_unittest.cc

@@ -17,6 +17,7 @@
 #include "base/test/bind_test_util.h"
 #include "base/test/scoped_task_environment.h"
 #include "base/test/test_timeouts.h"
+#include "build/build_config.h"
 #include "google/protobuf/io/coded_stream.h"
 #include "google/protobuf/io/zero_copy_stream_impl_lite.h"
 #include "google/protobuf/wire_format_lite.h"
@@ -432,7 +433,13 @@ TEST_F(GCMConnectionHandlerImplTest, ReInit) {
 }
 
 // Verify that messages can be received after initialization.
-TEST_F(GCMConnectionHandlerImplTest, RecvMsg) {
+// Flaky on Linux (crbug.com/906093)
+#if defined(OS_LINUX)
+#define MAYBE_RecvMsg DISABLED_RecvMsg
+#else
+#define MAYBE_RecvMsg RecvMsg
+#endif
+TEST_F(GCMConnectionHandlerImplTest, MAYBE_RecvMsg) {
   std::string handshake_request = EncodeHandshakeRequest();
   WriteList write_list(1, net::MockWrite(net::ASYNC,
                                          handshake_request.c_str(),