Create a broker interface for the new Mojo EDK so that the browser can create and duplicate messa...

mojo/edk/embedder/platform_channel_pair.h

Index: mojo/edk/embedder/platform_channel_pair.h
diff --git a/mojo/edk/embedder/platform_channel_pair.h b/mojo/edk/embedder/platform_channel_pair.h
index 74878370fa99423219894ed42ebc868d54b36fe6..80acc17c6881ab0388d2c07bc82e17a5370f1ce8 100644
--- a/mojo/edk/embedder/platform_channel_pair.h
+++ b/mojo/edk/embedder/platform_channel_pair.h
@@ -52,7 +52,9 @@ using HandlePassingInformation = base::FileHandleMappingVector;
 // platform differences in suppressing |SIGPIPE|.
 class MOJO_SYSTEM_IMPL_EXPORT PlatformChannelPair {
  public:
-  PlatformChannelPair();
+  // If |client_is_blocking| is true, then the client handle only supports
+   // blocking reads and writes. The default is nonblocking.
+  PlatformChannelPair(bool client_is_blocking = false);
   ~PlatformChannelPair();
 
   ScopedPlatformHandle PassServerHandle();
@@ -67,6 +69,10 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformChannelPair {
   static ScopedPlatformHandle PassClientHandleFromParentProcess(
       const base::CommandLine& command_line);
 
+  // Like above, but gets the handle from the passed in string.
+  static ScopedPlatformHandle PassClientHandleFromParentProcessFromString(
+      const std::string& value);
+
   // Prepares to pass the client channel to a new child process, to be launched
   // using |LaunchProcess()| (from base/launch.h). Modifies |*command_line| and
   // |*handle_passing_info| as needed.
@@ -75,6 +81,10 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformChannelPair {
       base::CommandLine* command_line,
       HandlePassingInformation* handle_passing_info) const;
 
+  // Like above, but returns a string instead of changing the command line.
+  std::string PrepareToPassClientHandleToChildProcessAsString(
+      HandlePassingInformation* handle_passing_info) const;
+
   // To be called once the child process has been successfully launched, to do
   // any cleanup necessary.
   void ChildProcessLaunched();