Enable posting a message from JS to Android webview.

android_webview/renderer/aw_message_port_client.cc

+// Copyright 2015 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 "android_webview/renderer/aw_message_port_client.h"
+
+#include "android_webview/common/aw_message_port_messages.h"
+#include "content/public/renderer/render_frame.h"
+#include "content/public/renderer/render_view.h"
+#include "content/public/renderer/v8_value_converter.h"
+#include "ipc/ipc_message_macros.h"
+#include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebKit.h"
+#include "third_party/WebKit/public/web/WebSerializedScriptValue.h"
+#include "third_party/WebKit/public/web/WebView.h"
+#include "v8/include/v8.h"
+
+using blink::WebSerializedScriptValue;
+using content::V8ValueConverter;
+using std::vector;
+
+namespace android_webview {
+
+AwMessagePortClient::AwMessagePortClient(content::RenderFrame* render_frame)
+    : content::RenderFrameObserver(render_frame) {
+}
+
+AwMessagePortClient::~AwMessagePortClient() {
+}
+
+bool AwMessagePortClient::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(AwMessagePortClient, message)
+    IPC_MESSAGE_HANDLER(AwMessagePortMsg_Message, OnPostMessage)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void AwMessagePortClient::OnPostMessage(
+    int message_port_id,
+    const base::string16& message,
+    const vector<int>& sent_message_port_ids) {
+  v8::HandleScope handle_scope(blink::mainThreadIsolate());
+  blink::WebFrame* main_frame =
+      render_frame()->GetRenderView()->GetWebView()->mainFrame();
+  if (main_frame == nullptr) {
+    return;
+  }
+  v8::Local<v8::Context> context = main_frame->mainWorldScriptContext();
+  v8::Context::Scope context_scope(context);
+  DCHECK(!context.IsEmpty());
+  WebSerializedScriptValue v = WebSerializedScriptValue::fromString(message);
+  v8::Handle<v8::Value> v8value = v.deserialize();
+
+  scoped_ptr<V8ValueConverter> converter;
+  converter.reset(V8ValueConverter::create());
+  converter->SetDateAllowed(true);
+  converter->SetRegExpAllowed(true);
+  base::ListValue result;
+  result.Append(converter->FromV8Value(v8value, context));
+  Send(new AwMessagePortHostMsg_ConvertedMessage(render_frame()->GetRoutingID(),
+                                                 message_port_id,
+                                                 result,
+                                                 sent_message_port_ids));
+}
+
+}