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

mojo/edk/system/core.h

Index: mojo/edk/system/core.h
diff --git a/third_party/mojo/src/mojo/edk/system/core.h b/mojo/edk/system/core.h
similarity index 93%
copy from third_party/mojo/src/mojo/edk/system/core.h
copy to mojo/edk/system/core.h
index 4ed5edeedc31a184501543fafca243a9bed22a00..bae038a447c67e53e58782b1c7508098d175e70f 100644
--- a/third_party/mojo/src/mojo/edk/system/core.h
+++ b/mojo/edk/system/core.h
@@ -10,10 +10,10 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
 #include "mojo/edk/system/handle_table.h"
 #include "mojo/edk/system/mapping_table.h"
 #include "mojo/edk/system/memory.h"
-#include "mojo/edk/system/mutex.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/c/system/buffer.h"
 #include "mojo/public/c/system/data_pipe.h"
@@ -23,13 +23,10 @@
 
 namespace mojo {
 
-namespace embedder {
-class PlatformSupport;
-}
-
-namespace system {
+namespace edk {
 
 class Dispatcher;
+class PlatformSupport;
 struct HandleSignalsState;
 
 // |Core| is an object that implements the Mojo system calls. All public methods
@@ -41,7 +38,7 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
   // These methods are only to be used by via the embedder API (and internally):
 
   // |*platform_support| must outlive this object.
-  explicit Core(embedder::PlatformSupport* platform_support);
+  explicit Core(PlatformSupport* platform_support);
   virtual ~Core();
 
   // Adds |dispatcher| to the handle table, returning the handle for it. Returns
@@ -69,7 +66,7 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
                        MojoHandleSignals signals,
                        const base::Callback<void(MojoResult)>& callback);
 
-  embedder::PlatformSupport* platform_support() const {
+  PlatformSupport* platform_support() const {
     return platform_support_;
   }
 
@@ -173,20 +170,20 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
                               uint32_t* result_index,
                               HandleSignalsState* signals_states);
 
-  embedder::PlatformSupport* const platform_support_;
+  PlatformSupport* const platform_support_;
 
-  // TODO(vtl): |handle_table_mutex_| should be a reader-writer lock (if only we
+  // TODO(vtl): |handle_table_lock_| should be a reader-writer lock (if only we
   // had them).
-  Mutex handle_table_mutex_;
-  HandleTable handle_table_ MOJO_GUARDED_BY(handle_table_mutex_);
+  base::Lock handle_table_lock_;  // Protects |handle_table_|.
+  HandleTable handle_table_;
 
-  Mutex mapping_table_mutex_;
-  MappingTable mapping_table_ MOJO_GUARDED_BY(mapping_table_mutex_);
+  base::Lock mapping_table_lock_;  // Protects |mapping_table_|.
+  MappingTable mapping_table_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CORE_H_