Add a content API for postMessage

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 9f74b84ea1e282adc42c8e7e8e172918c4b22d4c..3f9d02f5042197f061e28297d2938a8e3d13ab69 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -1445,6 +1445,26 @@ void ContentViewCoreImpl::EvaluateJavaScript(JNIEnv* env,
       c_callback);
 }
 
+void ContentViewCoreImpl::PostMessageToMainWindow(JNIEnv* env, jobject obj,
+    jstring message, jstring target_origin) {
+
+  RenderViewHost* host = web_contents_->GetRenderViewHost();
+  ViewMsg_PostMessage_Params params;
+  // TODO(sgurun) What should be the value of source_origin for webview
+  // params.source_origin =? "/";
+  // TODO(sgurun) see why this seems to not work
+  //params.target_origin = ConvertJavaStringToUTF16(env, target_origin);
+  // TODO(sgurun) do not use JSON, pass as base::value
+  params.data = ConvertJavaStringToUTF16(env, message);
+  params.is_data_raw_string = true;
+  params.source_routing_id = GetWebContents()->GetRoutingID();

[nasko, 2014/06/20 16:56:52]

The source routing id is the same routing ID as the target, which doesn't look
correct. Since the source is WebView, we probably need a constant to identify
this case. We could use MSG_ROUTING_NONE, but not sure yet.

[sgurun-gerrit only, 2014/07/11 00:45:46]

Done.

+  // TODO(sgurun) do add port ids once we add support for that.
+
+  if (host)
+    host->Send(new ViewMsg_PostMessageEvent(host->GetRoutingID(), params));
+}
+
+
 bool ContentViewCoreImpl::GetUseDesktopUserAgent(
     JNIEnv* env, jobject obj) {
   NavigationEntry* entry = web_contents_->GetController().GetVisibleEntry();