Implements JS bindings for mojo data pipe.

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

Index: third_party/WebKit/Source/core/mojo/MojoHandle.h
diff --git a/third_party/WebKit/Source/core/mojo/MojoHandle.h b/third_party/WebKit/Source/core/mojo/MojoHandle.h
index 61e4048c9319dfebd50acf8cab5b4db12af46f09..8e5bdadbf04de820d380a84082e89a439477e5f1 100644
--- a/third_party/WebKit/Source/core/mojo/MojoHandle.h
+++ b/third_party/WebKit/Source/core/mojo/MojoHandle.h
@@ -15,10 +15,14 @@ class MojoCreateSharedBufferResult;
 class MojoDuplicateBufferHandleOptions;
 class MojoHandleSignals;
 class MojoMapBufferResult;
+class MojoReadDataFlags;
+class MojoReadDataResult;
 class MojoReadMessageFlags;
 class MojoReadMessageResult;
 class MojoWatchCallback;
 class MojoWatcher;
+class MojoWriteDataFlags;
+class MojoWriteDataResult;
 class ScriptState;
 
 class MojoHandle final : public GarbageCollectedFinalized<MojoHandle>,
@@ -38,6 +42,19 @@ class MojoHandle final : public GarbageCollectedFinalized<MojoHandle>,
                           const HeapVector<Member<MojoHandle>>&);
   void readMessage(const MojoReadMessageFlags&, MojoReadMessageResult&);
 
+  // DataPipe handle.
+  void writeData(ArrayBufferOrArrayBufferView&,

[jbroman, 2017/03/07 16:01:44]

nit: I think the ArrayBufferOrArrayBufferView parameter here and below can be
const&.

[alokp, 2017/03/07 19:34:20]

Done.

+                 const MojoWriteDataFlags&,
+                 MojoWriteDataResult&);
+  void readData(const MojoReadDataFlags&, MojoReadDataResult&);
+  void readData(const MojoReadDataFlags&,
+                unsigned numBytes,
+                MojoReadDataResult&);
+  void readData(const MojoReadDataFlags&,
+                unsigned numBytes,
+                ArrayBufferOrArrayBufferView&,
+                MojoReadDataResult&);
+
   // SharedBuffer handle.
   void mapBuffer(unsigned offset, unsigned numBytes, MojoMapBufferResult&);
   void duplicateBufferHandle(const MojoDuplicateBufferHandleOptions&,