Enable posting a message from JS to Android webview.

content/public/browser/message_port_delegate.h

Index: content/public/browser/message_port_delegate.h
diff --git a/content/browser/message_port_delegate.h b/content/public/browser/message_port_delegate.h
similarity index 76%
rename from content/browser/message_port_delegate.h
rename to content/public/browser/message_port_delegate.h
index 8f6ad1b06973f46d0744654f4e34c066d578f822..70abbeb25eb17bcec9bdf9eba3b9cb3fb176821e 100644
--- a/content/browser/message_port_delegate.h
+++ b/content/public/browser/message_port_delegate.h
@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_BROWSER_MESSAGE_PORT_DELEGATE_H_
-#define CONTENT_BROWSER_MESSAGE_PORT_DELEGATE_H_
+#ifndef CONTENT_PUBLIC_BROWSER_MESSAGE_PORT_DELEGATE_H_
+#define CONTENT_PUBLIC_BROWSER_MESSAGE_PORT_DELEGATE_H_
 
 #include <vector>
 
 #include "base/strings/string16.h"
+#include "content/common/content_export.h"
 
 namespace content {
 
@@ -15,7 +16,7 @@ namespace content {
 // correct renderer. Delegates are responsible for managing their own lifetime,
 // and should call MessagePortService::OnMessagePortDelegateClosing if they are
 // destroyed while there are still message ports associated with them.
-class MessagePortDelegate {
+class CONTENT_EXPORT MessagePortDelegate {
  public:
   // Sends a message to the given route. Implementations are responsible for
   // updating MessagePortService with new routes for the sent message ports.
@@ -23,7 +24,7 @@ class MessagePortDelegate {
                            const base::string16& message,
                            const std::vector<int>& sent_message_port_ids) = 0;
 
-  // Sends a "messages are queued" IPC to the given route.
+  // Requests messages to the given route to be queued.
   virtual void SendMessagesAreQueued(int route_id) = 0;
 
  protected:
@@ -32,4 +33,4 @@ class MessagePortDelegate {
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_MESSAGE_PORT_DELEGATE_H_
+#endif  // CONTENT_PUBLIC_BROWSER_MESSAGE_PORT_DELEGATE_H_