Implements JS bindings for mojo data pipe.

third_party/WebKit/Source/core/mojo/MojoHandle.idl

Index: third_party/WebKit/Source/core/mojo/MojoHandle.idl
diff --git a/third_party/WebKit/Source/core/mojo/MojoHandle.idl b/third_party/WebKit/Source/core/mojo/MojoHandle.idl
index 78a49ed0fd4be0c51ac155307da18422f4845550..9586039d627cd06b57a3d3f19a85f954f628d30c 100644
--- a/third_party/WebKit/Source/core/mojo/MojoHandle.idl
+++ b/third_party/WebKit/Source/core/mojo/MojoHandle.idl
@@ -15,6 +15,13 @@ callback MojoWatchCallback = void (MojoResult result);
     MojoResult writeMessage(BufferSource buffer, sequence<MojoHandle> handles);
     MojoReadMessageResult readMessage(optional MojoReadMessageFlags flags);
 
+    // TODO(alokp): Create DataPipeHandle, a subclass of MojoHandle

[jbroman, 2017/03/07 20:31:47]

If you do this, wouldn't it be a MojoDataPipeProducerHandle and a
MojoDataPipeConsumerHandle? IIUC each handle can only be used for one set of
operations.

[alokp, 2017/03/07 20:49:32]

Ah yes - updated comment.

+    // and move the following member functions.
+    MojoWriteDataResult writeData(BufferSource buffer, optional MojoWriteDataOptions options);
+    MojoReadDataResult queryData();
+    MojoReadDataResult discardData(unsigned long numBytes, optional MojoDiscardDataOptions options);
+    MojoReadDataResult readData(unsigned long numBytes, BufferSource buffer, optional MojoReadDataOptions options);
+
     // TODO(alokp): Create SharedBufferHandle, a subclass of MojoHandle
     // and move the following member functions.
     MojoMapBufferResult mapBuffer(unsigned long offset, unsigned long numBytes);