Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/test/multiprocess_test_helper.cc

Index: mojo/edk/test/multiprocess_test_helper.cc
diff --git a/third_party/mojo/src/mojo/edk/test/multiprocess_test_helper.cc b/mojo/edk/test/multiprocess_test_helper.cc
similarity index 90%
copy from third_party/mojo/src/mojo/edk/test/multiprocess_test_helper.cc
copy to mojo/edk/test/multiprocess_test_helper.cc
index c107a02da2abf627778b6c4807fc3600e4d3ffc6..10645f9311e1b3dd4825b51ebc8447df60af55ba 100644
--- a/third_party/mojo/src/mojo/edk/test/multiprocess_test_helper.cc
+++ b/mojo/edk/test/multiprocess_test_helper.cc
@@ -12,10 +12,11 @@
 #include "mojo/edk/embedder/platform_channel_pair.h"
 
 namespace mojo {
+namespace edk {
 namespace test {
 
 MultiprocessTestHelper::MultiprocessTestHelper() {
-  platform_channel_pair_.reset(new embedder::PlatformChannelPair());
+  platform_channel_pair_.reset(new PlatformChannelPair());
   server_platform_handle = platform_channel_pair_->PassServerHandle();
 }
 
@@ -41,7 +42,7 @@ void MultiprocessTestHelper::StartChildWithExtraSwitch(
 
   base::CommandLine command_line(
       base::GetMultiProcessTestChildBaseCommandLine());
-  embedder::HandlePassingInformation handle_passing_info;
+  HandlePassingInformation handle_passing_info;
   platform_channel_pair_->PrepareToPassClientHandleToChildProcess(
       &command_line, &handle_passing_info);
 
@@ -88,12 +89,13 @@ bool MultiprocessTestHelper::WaitForChildTestShutdown() {
 void MultiprocessTestHelper::ChildSetup() {
   CHECK(base::CommandLine::InitializedForCurrentProcess());
   client_platform_handle =
-      embedder::PlatformChannelPair::PassClientHandleFromParentProcess(
+      PlatformChannelPair::PassClientHandleFromParentProcess(
           *base::CommandLine::ForCurrentProcess());
 }
 
 // static
-embedder::ScopedPlatformHandle MultiprocessTestHelper::client_platform_handle;
+ScopedPlatformHandle MultiprocessTestHelper::client_platform_handle;
 
 }  // namespace test
+}  // namespace edk
 }  // namespace mojo