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

mojo/edk/system/message_in_transit.h

Index: mojo/edk/system/message_in_transit.h
diff --git a/third_party/mojo/src/mojo/edk/system/message_in_transit.h b/mojo/edk/system/message_in_transit.h
similarity index 73%
copy from third_party/mojo/src/mojo/edk/system/message_in_transit.h
copy to mojo/edk/system/message_in_transit.h
index 2edc7762a63f185f0777ff1160eafb426c950229..95a53b59db69088a7127e7a242be1f32ec4f1f8f 100644
--- a/third_party/mojo/src/mojo/edk/system/message_in_transit.h
+++ b/mojo/edk/system/message_in_transit.h
@@ -13,16 +13,15 @@
 
 #include "base/memory/aligned_memory.h"
 #include "base/memory/scoped_ptr.h"
-#include "mojo/edk/system/channel_endpoint_id.h"
 #include "mojo/edk/system/dispatcher.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
-class Channel;
+class RawChannel;
 class TransportData;
 
 // This class is used to represent data in transit. It is thread-unsafe.
@@ -45,51 +44,9 @@ class TransportData;
 class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
  public:
   enum class Type : uint16_t {
-    // Messages that are forwarded to endpoint clients.
-    ENDPOINT_CLIENT = 0,
-    // Messages that are consumed by the |ChannelEndpoint|.
-    ENDPOINT = 1,
-    // Messages that are consumed by the |Channel|.
-    CHANNEL = 2,
-    // Messages that are consumed by the |RawChannel| (implementation).
-    RAW_CHANNEL = 3,
-    // |ConnectionManager| implementations also use |RawChannel|s.
-    // Messages sent to a |MasterConnectionManager|.
-    CONNECTION_MANAGER = 4,
-    // Messages sent by a |MasterConnectionManager| (all responses).
-    CONNECTION_MANAGER_ACK = 5,
-  };
-
-  enum class Subtype : uint16_t {
-    // Subtypes for type |Type::ENDPOINT_CLIENT|:
-    // Message pipe or data pipe data (etc.).
-    ENDPOINT_CLIENT_DATA = 0,
-    // Data pipe: consumer -> producer message that data was consumed. Payload
-    // is |RemoteDataPipeAck|.
-    ENDPOINT_CLIENT_DATA_PIPE_ACK = 1,
-    // Subtypes for type |Type::ENDPOINT|:
-    // TODO(vtl): Nothing yet.
-    // Subtypes for type |Type::CHANNEL|:
-    CHANNEL_ATTACH_AND_RUN_ENDPOINT = 0,
-    CHANNEL_REMOVE_ENDPOINT = 1,
-    CHANNEL_REMOVE_ENDPOINT_ACK = 2,
-    // Subtypes for type |Type::RAW_CHANNEL|:
-    RAW_CHANNEL_POSIX_EXTRA_PLATFORM_HANDLES = 0,
-    // Subtypes for type |Type::CONNECTION_MANAGER| (the message data is always
-    // a buffer containing the connection ID):
-    CONNECTION_MANAGER_ALLOW_CONNECT = 0,
-    CONNECTION_MANAGER_CANCEL_CONNECT = 1,
-    CONNECTION_MANAGER_CONNECT = 2,
-    // Subtypes for type |Type::CONNECTION_MANAGER_ACK|, corresponding to
-    // |ConnectionManager::Result| values (failure and non-"connect" acks never
-    // have any message contents; success acks for "connect" always have a
-    // |ConnectionManagerAckSuccessConnectData| as data and also a platform
-    // handle attached for "new connection"):
-    CONNECTION_MANAGER_ACK_FAILURE = 0,
-    CONNECTION_MANAGER_ACK_SUCCESS = 1,
-    CONNECTION_MANAGER_ACK_SUCCESS_CONNECT_SAME_PROCESS = 2,
-    CONNECTION_MANAGER_ACK_SUCCESS_CONNECT_NEW_CONNECTION = 3,
-    CONNECTION_MANAGER_ACK_SUCCESS_CONNECT_REUSE_CONNECTION = 4,
+    MESSAGE = 0,
+    RAW_CHANNEL_POSIX_EXTRA_PLATFORM_HANDLES = 1,
+    RAW_CHANNEL_QUIT = 2,
   };
 
   // Messages (the header and data) must always be aligned to a multiple of this
@@ -141,11 +98,6 @@ class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
       return static_cast<const char*>(buffer_) + sizeof(Header);
     }
     Type type() const { return header()->type; }
-    Subtype subtype() const { return header()->subtype; }
-    ChannelEndpointId source_id() const { return header()->source_id; }
-    ChannelEndpointId destination_id() const {
-      return header()->destination_id;
-    }
 
    private:
     const Header* header() const { return static_cast<const Header*>(buffer_); }
@@ -160,12 +112,10 @@ class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
 
   // |bytes| is optional; if null, the message data will be zero-initialized.
   MessageInTransit(Type type,
-                   Subtype subtype,
                    uint32_t num_bytes,
                    const void* bytes);
   // |bytes| should be valid (and non-null), unless |num_bytes| is zero.
   MessageInTransit(Type type,
-                   Subtype subtype,
                    uint32_t num_bytes,
                    UserPointer<const void> bytes);
   // Constructs a |MessageInTransit| from a |View|.
@@ -198,7 +148,7 @@ class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
   // already have a secondary buffer (so this must only be called once). The
   // caller must ensure (e.g., by holding on to a reference) that |channel|
   // stays alive through the call.
-  void SerializeAndCloseDispatchers(Channel* channel);
+  void SerializeAndCloseDispatchers();
 
   // Gets the main buffer and its size (in number of bytes), respectively.
   const void* main_buffer() const { return main_buffer_.get(); }
@@ -219,16 +169,6 @@ class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
   void* bytes() { return main_buffer_.get() + sizeof(Header); }
 
   Type type() const { return header()->type; }
-  Subtype subtype() const { return header()->subtype; }
-  ChannelEndpointId source_id() const { return header()->source_id; }
-  ChannelEndpointId destination_id() const { return header()->destination_id; }
-
-  void set_source_id(ChannelEndpointId source_id) {
-    header()->source_id = source_id;
-  }
-  void set_destination_id(ChannelEndpointId destination_id) {
-    header()->destination_id = destination_id;
-  }
 
   // Gets the dispatchers attached to this message; this may return null if
   // there are none. Note that the caller may mutate the set of dispatchers
@@ -259,10 +199,7 @@ class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
     // |SerializeAndCloseDispatchers()| has not been called.
     uint32_t total_size;
     Type type;                         // 2 bytes.
-    Subtype subtype;                   // 2 bytes.
-    ChannelEndpointId source_id;       // 4 bytes.
-    ChannelEndpointId destination_id;  // 4 bytes.
-    // Size of actual message data.
+    Type blahblahforalignment;                         // 2 bytes.
     uint32_t num_bytes;
     uint32_t unused;
   };
@@ -272,7 +209,7 @@ class MOJO_SYSTEM_IMPL_EXPORT MessageInTransit {
   }
   Header* header() { return reinterpret_cast<Header*>(main_buffer_.get()); }
 
-  void ConstructorHelper(Type type, Subtype subtype, uint32_t num_bytes);
+  void ConstructorHelper(Type type, uint32_t num_bytes);
   void UpdateTotalSize();
 
   const size_t main_buffer_size_;
@@ -296,14 +233,7 @@ MOJO_SYSTEM_IMPL_EXPORT inline std::ostream& operator<<(
   return out << static_cast<uint16_t>(type);
 }
 
-// So logging macros and |DCHECK_EQ()|, etc. work.
-MOJO_SYSTEM_IMPL_EXPORT inline std::ostream& operator<<(
-    std::ostream& out,
-    MessageInTransit::Subtype subtype) {
-  return out << static_cast<uint16_t>(subtype);
-}
-
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_H_