Code to facilitate sending message to external host.

Note that at this time the parameters to the message
are still tentative. The call goes as a sync call from
renderer to the browser. From then onwards it happens 
async and no return value is available yet.


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@957 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 24 insertions, 0 deletions

diff --git a/chrome/browser/render_view_host.cc b/chrome/browser/render_view_host.cc
index 0b84911..a6b0f9d 100644
--- a/chrome/browser/render_view_host.cc
+++ b/chrome/browser/render_view_host.cc
@@ -665,6 +665,8 @@ void RenderViewHost::OnMessageReceived(const IPC::Message& msg) {
                         OnMsgDomOperationResponse)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DOMUISend,
                         OnMsgDOMUISend)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_ExternalHostMessage,
+                        OnMsgExternalHostMessage)
 #ifdef CHROME_PERSONALIZATION
     IPC_MESSAGE_HANDLER(ViewHostMsg_PersonalizationEvent,
                         OnPersonalizationEvent)
@@ -1013,6 +1015,12 @@ void RenderViewHost::OnMsgDOMUISend(
   delegate_->ProcessDOMUIMessage(message, content);
 }
 
+void RenderViewHost::OnMsgExternalHostMessage(
+    const std::string& receiver,
+    const std::string& message) {
+  delegate_->ProcessExternalHostMessage(receiver, message);
+}
+
 #ifdef CHROME_PERSONALIZATION
 void RenderViewHost::OnPersonalizationEvent(const std::string& message,
                                                const std::string& content) {
diff --git a/chrome/browser/render_view_host.h b/chrome/browser/render_view_host.h
index b546331..2faf76a 100644
--- a/chrome/browser/render_view_host.h
+++ b/chrome/browser/render_view_host.h
@@ -459,6 +459,8 @@ class RenderViewHost : public RenderWidgetHost {
                                  int automation_id);
   void OnMsgDOMUISend(const std::string& message,
                       const std::string& content);
+  void OnMsgExternalHostMessage(const std::string& receiver,
+                                const std::string& message);
 #ifdef CHROME_PERSONALIZATION
   void OnPersonalizationEvent(const std::string& message,
                               const std::string& content);
diff --git a/chrome/browser/render_view_host_delegate.h b/chrome/browser/render_view_host_delegate.h
index 959f427..c6cc9a2 100644
--- a/chrome/browser/render_view_host_delegate.h
+++ b/chrome/browser/render_view_host_delegate.h
@@ -220,6 +220,12 @@ class RenderViewHostDelegate {
   virtual void ProcessDOMUIMessage(const std::string& message,
                                    const std::string& content) { }
 
+  // A message for external host. By default we ignore such messages.
+  // |receiver| can be a receiving script and |message| is any
+  // arbitrary string that makes sense to the receiver.
+  virtual void ProcessExternalHostMessage(const std::string& receiver,
+                                          const std::string& message) { }
+
   // Navigate to the history entry for the given offset from the current
   // position within the NavigationController.  Makes no change if offset is
   // not valid.
diff --git a/chrome/browser/web_contents.cc b/chrome/browser/web_contents.cc
index 32b1ecd..96834dc 100644
--- a/chrome/browser/web_contents.cc
+++ b/chrome/browser/web_contents.cc
@@ -1988,6 +1988,12 @@ void WebContents::DomOperationResponse(const std::string& json_string,
       Details<DomOperationNotificationDetails>(&details));
 }
 
+void WebContents::ProcessExternalHostMessage(const std::string& receiver,
+                                             const std::string& message) {
+  if (delegate())
+    delegate()->SendExternalHostMessage(receiver, message);
+}
+
 void WebContents::GoToEntryAtOffset(int offset) {
   if (!controller())
     return;
diff --git a/chrome/browser/web_contents.h b/chrome/browser/web_contents.h
index b61eb70..09a07d0 100644
--- a/chrome/browser/web_contents.h
+++ b/chrome/browser/web_contents.h
@@ -427,6 +427,8 @@ class WebContents : public TabContents,
                               WindowOpenDisposition disposition);
   virtual void DomOperationResponse(const std::string& json_string,
                                     int automation_id);
+  virtual void ProcessExternalHostMessage(const std::string& receiver,
+                                          const std::string& message);
   virtual void GoToEntryAtOffset(int offset);
   virtual void GetHistoryListCount(int* back_list_count,
                                    int* forward_list_count);