Make GlobalDescriptors::MaybeGet return -1 when the key is not found.

ipc/ipc_tests.cc

Index: ipc/ipc_tests.cc
diff --git a/ipc/ipc_tests.cc b/ipc/ipc_tests.cc
index 763a59278e6dd17999f59769db868e9dde510ccc..18d7dcc6fc9c3dbdda32fd5460c60f20b37fbb51 100644
--- a/ipc/ipc_tests.cc
+++ b/ipc/ipc_tests.cc
@@ -32,6 +32,11 @@
 #include "ipc/ipc_switches.h"
 #include "testing/multiprocess_func_list.h"
 
+#if defined(OS_POSIX)
+#include "base/global_descriptors_posix.h"
+#include "ipc/ipc_descriptors.h"
+#endif
+
 // Define to enable IPC performance testing instead of the regular unit tests
 // #define PERFORMANCE_TEST
 
@@ -44,6 +49,14 @@ const size_t kLongMessageStringNumBytes = 50000;
 
 #ifndef PERFORMANCE_TEST
 
+int MultiProcessTestIPCSetUp() {
+#if defined(OS_POSIX)
+  base::GlobalDescriptors::GetInstance()->Set(kPrimaryIPCChannel,
+      kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
+#endif
+  return 0;
+}
+
 void IPCChannelTest::SetUp() {
   MultiProcessTest::SetUp();
 
@@ -402,7 +415,7 @@ TEST_F(IPCChannelTest, MAYBE_SendMessageInChannelConnected) {
   base::CloseProcessHandle(process_handle);
 }
 
-MULTIPROCESS_TEST_MAIN(RunTestClient) {
+MULTIPROCESS_TEST_MAIN(RunTestClient, MultiProcessTestIPCSetUp) {
   MessageLoopForIO main_message_loop;
   MyChannelListener channel_listener;
 
@@ -572,7 +585,11 @@ TEST_F(IPCChannelTest, Performance) {
 }
 
 // This message loop bounces all messages back to the sender
-MULTIPROCESS_TEST_MAIN(RunReflector) {
+MULTIPROCESS_TEST_MAIN(RunReflector, MultiProcessTestIPCSetUp) {
+#if defined(OS_POSIX)
+  base::GlobalDescriptors::GetInstance()->Set(kPrimaryIPCChannel,
+      kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
+#endif
   MessageLoopForIO main_message_loop;
   IPC::Channel chan(kReflectorChannel, IPC::Channel::MODE_CLIENT, NULL);
   ChannelReflectorListener channel_reflector_listener(&chan);