Add a content API for postMessage

content/browser/android/content_view_core_impl.cc

 // Copyright 2012 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/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 1427 matching lines @@
   ScopedJavaGlobalRef<jobject> j_callback;
   j_callback.Reset(env, callback);
   content::RenderFrameHost::JavaScriptResultCallback c_callback =
       base::Bind(&JavaScriptResultCallback, j_callback);
 
   web_contents_->GetMainFrame()->ExecuteJavaScript(
       ConvertJavaStringToUTF16(env, script),
       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();
   return entry && entry->GetIsOverridingUserAgent();
 }
 
 void ContentViewCoreImpl::UpdateImeAdapter(long native_ime_adapter,
                                            int text_input_type,
                                            const std::string& text,
                                            int selection_start,
@@ skipping 174 matching lines @@
       reinterpret_cast<ui::WindowAndroid*>(window_android),
       retained_objects_set);
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content