Web MIDI: enable midi_host.cc implementation on Android

content/browser/renderer_host/media/midi_host.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/media/midi_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/process/process.h"
@@ skipping 76 matching lines @@
        input_ports,
        output_ports));
 }
 
 void MIDIHost::OnSendData(int port,
                           const std::vector<uint8>& data,
                           double timestamp) {
   if (!midi_manager_)
     return;
 
+  if (data.empty())
+    return;
+
   base::AutoLock auto_lock(in_flight_lock_);
 
   // Sanity check that we won't send too much.
   if (sent_bytes_in_flight_ > kMaxInFlightBytes ||
       data.size() > kMaxInFlightBytes ||
       data.size() + sent_bytes_in_flight_ > kMaxInFlightBytes)
     return;
 
   // For now disallow all System Exclusive messages even if we
   // have permission.
   // TODO(toyoshim): allow System Exclusive if browser has granted
   // this client access.  We'll likely need to pass a GURL
   // here to compare against our permissions.
-  if (data.size() > 0 && data[0] >= kSysExMessage)
+  if (data[0] >= kSysExMessage)
       return;
 
-#if defined(OS_ANDROID)
-  // TODO(toyoshim): figure out why data() method does not compile on Android.
-  NOTIMPLEMENTED();
-#else
   midi_manager_->DispatchSendMIDIData(
       this,
       port,
-      data.data(),
+      &data[0],
       data.size(),
       timestamp);
-#endif
 
   sent_bytes_in_flight_ += data.size();
 }
 
 void MIDIHost::ReceiveMIDIData(
     int port_index,
     const uint8* data,
     size_t length,
     double timestamp) {
   TRACE_EVENT0("midi", "MIDIHost::ReceiveMIDIData");
@@ skipping 24 matching lines @@
 
   if (bytes_sent_since_last_acknowledgement_ >=
       kAcknowledgementThresholdBytes) {
     Send(new MIDIMsg_AcknowledgeSentData(
         bytes_sent_since_last_acknowledgement_));
     bytes_sent_since_last_acknowledgement_ = 0;
   }
 }
 
 }  // namespace content